Direct Express complaint: Fraud

I just filed another dispute with them, and was told that they did not file the dispute for me. This is not the first time that I have turned in a fraud complaint to them, they just return a letter with no fraud found no fraud found. I don’t even think they investigate ( which they are supposed to do) I have probably had a few thousand dollars taken from my account without authorisation from me. They know I am on disability, that’s where my check comes from, they know how much I get a month and that all I basically pay are my bills every month. I recently in the last few days had them take all of my money out of my account and tell me thati am now overdrawn. I have turned in several disputes with them and even sent proof that it was not me and they still don’t seem to look into it. They wouldn’t even take a dispute this last time, and that was every cent I had in the bank. I asked to talk to someone in the hardship department after I was told that they would not take a dispute from me and they told me they couldn’t do that.. I am a disabled older woman, I am not trying to get money that isn’t mine. This last dispute was for money sent through Western Union, I called Western Union and they took the dispute and gave me a case number and asked that the bank fraud department call them so that I could get my money back and the bank fraud department said they are not allowed to call the Western Union fraud department. The way I found out was on the 7th of January 2022, at 9:30 I tried to order a pizza for supper and the cead was declined, and I know I had money in my account, so I called the banks auto teller and it said I was overdrawn. So I called the following day and they told me my account was overdrawn. I don’t even know who to contact about this situation. Please help