Product: Bank account or service

On XX/XX/XXXX my mother told me come down to U.S. Bank, I went down to U.S. Bank and was met by my mother and my sister I sat down with the banker and my mother said my father wanted me to have his savings account, her and I were both pay on death of my father 's account. So after XXXX min of paperwork with the banker I was issued a cashiers check for {$41000.00} I then took the cashiers check and opened a new checking and savings account within US Bank in my soul name and deposited the money within the savings account. So then 11 months later after a falling out with my mother in XX/XX/XXXX on or about XX/XX/XXXX l received a call from US Bank telling me my account has been frozen that my mother had come in to the bank on or about XX/XX/XXXX saying she never got her {$20000.00} and that if I do n't provide proof that my mother has no interest in my account that they will be giving her {$20000.00}. So I contacted the district manager and she informed me that there 's nothing I can do about it and that when my fathers Account was closed the banker did n't do the paperwork right. So I went down to the bank and spoke with them and I repeatedly told them this was my account and it had nothing to do with the previous account that had already been closed this account is only in my name and has no ties to my mother or my deceased father 's previous account. After two weeks of contacting corporate and speaking with countless people and everybody saying that that 's not right that this ca n't happen then told me to speak with the District manager and that it was her decision so, to no avail on XX/XX/XXXX they withdrew {$20000.00} and gave it to my mother. I even opened a case with the XXXX and us banks District managers response was that they will stand by their decision and that they considered this is an error on my account and they have to right to disperse my funds how they see fit and that they were unable to obtain security footage from the day of XX/XX/XXXX which leads me to believe that my mother is saying she was not there when my fathers account was closed? On any pay on death all parties must be present when account is closed she had and was there for his account to be closed I tried to obtain any of the sign documents from the bank but they informed me they do not keep any records and that they do not have any of the signed documents from my fathers account being closed. So all the paperwork my mother and I signed the day of XX/XX/XXXX when my mother had to provide the death certificate to be able to close my father 's account cause my mothers name was n't on my fathers account it was his soul account, they tell me there 's nothing? I do n't understand how there can be no paperwork for an account being closed due to death for {$41000.00}. The paperwork had to be reviewed and signed off by upper management before I could be issued the cashiers check. How is it possible that the bank will allow a person to come back 11 months later and take something that is not theirs. I brought all these things up with the district manager but it fell upon deaf ears. The district manager would not help me all she would tell me is it is unfortunate. I also ask the district manager to refer this to the Superior Court to be heard in civil court but she declined and chose to disperse my funds.