Product: Checking or savings account

I am a XXXX XXXX XXXX XXXX XXXX XXXX XXXX XXXX with seven accounts ( personal and business ) with US Bank in XXXX, CA. All but one of these accounts were with XXXX XXXX which was sold and transferred to US Bank. On or about XXXX XXXX XXXX I sent a check to a law firm for a referral fee for {$150.00} from my business checking. At the time my business checking had about {$10000.00} ( $ XXXX was in there ) in it to pay my IRS XXXX quarterly tax payment. I went into the bank at the end of XXXX to deposit a check I wrote from the same account to my personal account for approximately {$1600.00}. I was also depositing money into my business account. The clerk notified me that my business account was negative prior to the deposit. I left the bank and checked my online banking and found that the check I had written for {$150.00} had cleared my account on or about XX/XX/XXXX for {$8000.00}. Although the writing is not completely clear I have a copy of the check which appears to be written to XXXX XXXX which appears to have been cashed at a US Bank at the ATM machine. 
The bank manager assisted me in filling out the paperwork and the affidavit which I filled out as correctly as I could. She advised me to not close the account because the fraud department, once they investigated, could only deposit the funds into the existing account. I submitted all the paperwork as quickly as I could. I was later told that I did have to close the account and that a new affidavit had to be filled out. Apparently the fraud department also opened a claim on the check I had written to myself for {$1600.00} prior to knowing the account was compromised. 
They asked me to file a claim for the monies they already took from my personal account. I did not as I was not alleging the {$1600.00} was fraud. I opened a new business account and had to notify all of the persons I had written checks to that their checks would bounce. Needless to say it has been a huge inconvenience. My credit card servicer XXXX takes fees out of this account from the monies to my XXXX account. The bank told me to take care of the paperwork with XXXX which I did however they show me as delinquent and are threatening not to collect credit cards for my business. 
I have contacted the bank numerous times, different departments and the fraud department. It seems there are three separate entities investigating. I submitted my paperwork numerous times and although the staff at US Bank has been pleasant, absolutely no one can tell me when the investigation will be complete. I will call one day and it is still under review and the next day it will be deficient and they will require another form. They just keep asking me to revise forms and resubmit affidavits. I filed a police report with XXXX Police Department immediately upon finding out about the fraud but they advised me that it's primarily a banking issue if I am requesting the money be returned. This has been a complete nightmare especially during the holidays and they are advising me that they have no time requirement for their fraud investigation. I am seeking any assistance you can give me on this issue. 
XXXX XXXX XXXX XXXX Attorney