This literally just feels like a scam

So I have not been able to access my fba account for a year or two for some reason and I have had about 500$ or so tied up in it. Yesterday I get a charge on my card from Amazon for 41$ and find that I can finally access my seller account again, so I contact support to find out where that 500$ went and why it wasn’t transferred to me, come to find out that they had locked my account for some reason (that they refused to tell me) and took all the money away due to monthly fees. They essentially just told me that all my money was taken away due to monthly fees and there was nothing that I could say or do about it because my account was “locked”.