@Alessio
The problem here is that FS cant be 100% sure whether you actually cheated or not. 99% of the times these things happen because someone actually cheated, and only sometimes( less than 1 %), a few innocent people get banned. In a system so big, its very hard to identify the 1% and so FS bans all those account that show even a hint of fraud. If your account has been deleted, its almost impossible to get it back and i doubt asking here will help you.
My advice, move on to another host or make a new fileserve account