My Transfer market got banned for no reason

I have been trading on the transfer market for the last week using a method which involves buying players at night when their cheap and selling them overnight when their expensive which has made me around 1 million coins in a week and I have been banned for it even know it’s not against the rules and I’m doing something that so many fc players do, I believe that I should be unbanned because this is not fair to me and to other people in my position.