Is it true that if I had $50K in a bank, for the sake of example let's use Bank of America, and the bank just straight up loses my account and loses track of th

Is it true that if I had $50K in a bank, for the sake of example let's use Bank of America, and the bank just straight up loses my account and loses track of the fact that I had that money with them, FDIC does not ensure I get my money back? Would I just be reliant on the bank having good will towards me and giving me my money voluntarily? Is there any consumer protection that actually protects the consumer against business malpractice like this if FDIC doesn't?