I Got Blocked from Transfer Market

I've been trading and making coins successfully since the start of the game, and i made few millions following the tips given by youtube influencers, and everything was great until last week. I tried a new strategy which is monitoring the cards that lose the highest percentage of their values on futgg.com (https://www.fut.gg/players/momentum/) and buy them at a low price and lazy list them for like 30% more. It worked perfectly and i made some profit that does not exceed 100k. While i was planning to continue doing this i received a message that says that i got blocked from transfer market for transferring coins! I guess the system blocked me cause i made high margin profits on some cards as mentioned, but this is not fair and there is nothing illegal about it! Go check for yourselves how cheap some cards are being offered in the market cause sellers are in a hurry to get some coins. Why do i get penalized? Even if this is "cheating", why would i cheat to get few thousand coins while my accounts has over 20 million! The worst part is that i've been trying to get in touch with anybody at customer support and all i get is a silly ai response. Somebody please advise.