Product: Checking or savings account

On XX/XX/XXXX I had deposited a cashiers check for {$20000.00} from my fianc boss into my Chase bank account. 
The reason for the deposit into my account was my fianc asked me to help her boss because he was having issues with his bank account. The said cashiers check was drawn on her bossess investment account. On XX/XX/XXXX there was a XXXX  payment from her boss in the amount of XXXX for her employment. On XX/XX/XXXX I deposited another cashiers check for XXXX for work that I had done for my fiancs boss for work from XX/XX/XXXX to XX/XX/XXXX. From the beginning on XX/XX/XXXX I deposited {$500.00} to open my account with Chase bank because I have banked with them previously XXXX years prior. I had financial issues and had to close my account in XXXX with Chase bank and at that time Chasewas very understanding and hoped to see me back soon. So when I opened a new account with Chase in XXXX  I felt confident in my decision because of my past experience with them. Between XX/XX/XXXX ( opened accountXXXX deposit ) and XX/XX/XXXX I had deposited roughly {$42000.00} into my Chase bank account. I used the ATM and the bank teller to withdraw my fianc and my money for XXXX and bills as well as our entertainment and my fianc bosses financial obligations and his misc. Financial needs. On the XXXX XX/XX/XXXX there was approximately {$4600.00} left in my account. Which was the remainder of my monies from the {$20000.00} cashiers check paid to me for services ( work ) rendered for my fianc boss. On XX/XX/XXXX I tried to use my debit card at an ATM it wouldn't complete my transaction stating please call the fraud hotline. I then called the fraud hotline immediately. Per the conversation with the banks fraud department my bank account was frozen because of a suspicion of fraudulent activity. I then asked what they meant and the representative stated that there was XXXX large deposits ( by cashiers check ) into my account with numerous withdrawals. I then asked why any of that would be suspicious and the representative stated because I just opened the account and there was to much activity on a new account. That was very confusing to me because I thought the reason people opened a bank account was to keep their money safe and accessible to them at anytime. When I inquired about what I needed to do and when I could access my {$4600.00} the representative stated that it could take up to XXXX business at which time I needed to supply a confirmation from the issuing bank of the cashiers checks. My fianc immediately called her boss then we picked him up and went to the issuing banks main office in XXXX  Florida upon arrival @ said bank my fianc and her boss spoke to a gentleman that handles this type of inquiry. The gentleman then called Chase bank and proceeded to inquire about the information my bank needed for authorization of said cashiers checks to release my remaining funds. Chase Bank told him he needed to call this bank to bank number and fax the information which he did immediately. I then called my bank back immediately after and they told me they will look Into it and I will be notified by mail within XXXX business with a check for my remaining balance of {$4600.00}. I waited approximately XXXX  days before I had called Chase again because I hadn't received my balance yet. A Chase representative told me that they would look into it further into why I haven't received my balance its been over XXXX  days. The representative told me i would have this issue resolved within XXXX business days more. I then waited XXXX more days ( for a total of XXXX business days ) when it was only supposed to be XXXX  days. On the XXXX business day after my account was frozen I called for a XXXX time to Chase bank to inquire about my remaining balance I was still owed and Chase 's representative I talked to said that I haven't received my remaining balance because the cashiers checks needed to be verified by the issuing bank. I explained to them that the issuing bank called them XXXX  days after they froze my account and sent and approved said cashiers checks. Chase 's representative then put me on hold to look into this allegation further. Approximately XXXX minutes later the representative returned to the conversation and stated that the {$20000.00} cashiers check on XX/XX/XXXX was deposited again on the XXXX XXXX XXXXXX/XX/XXXX. I was a little confused then realized my banks mistake and told the representative that was not the case. There was XXXX cashiers checks for {$20000.00} deposited into my account. XXXX one on XX/XX/XXXX and the XXXX cashiers check for {$20000.00} was deposited on XX/XX/XXXX. The representative argued with me for approximately XXXX minutes at the end of the conversation nothing was accomplished for me my bank still did not see their error and I believe they did not want to admit their mistake. I waited approximately XXXX more week called Chase bank again this time with my fianc boss ( since the cashiers checks and the zelle payment where from his financial institution ) so he could talk to my bank with me. Myself, my fiance & my fianc boss talked to Chase that day and Chase stated that the fraud department is still investigating and they are unsure the exact date they would release my remaining balance of {$450000.00} ( the original balance was {$4600.00} ) I asked why the amount has changed and they repeated to me because of administrative fees. I waited approximately XXXX month since my account was frozen ( it was XX/XX/XXXX ) when I reached out to Chase bank again ( because I still hadn't received my money from my now closed account ) the banks answer was because the cashiers check issuing bank needed to confirm the checks. I then stated to my bank that has already been done at least twice. My bank said they haven't received any confirmation. I have tried approximately XXXX more times since XX/XX/XXXX to get my money from my closed Chase bank account and I get nothing but the run around and lied to and treated as if I was a criminal. My fianc is XXXX and unable to work anymore that money that my bank stole from me was the last little bit I had to pay for our food/ living essentials. Because of my bank stealing my money I have lost our home and everything else. Please I am desperate for your help. Thank you