Binance used my money to buy a coin without asking me

I went to verify into my earn wallet or whatever that thing is known as, and out of the blue as an alternative of having roughly 4 USD of USDC, I had four USD of "F". I had purchased that coin before briefly, however this time I undoubtedly didn't, it appears Binance just took my cash and spent it without even warning me. Does anybody has an evidence as to why it occurred or find out how to forestall it?