all you have to do is ask the exchanger who was banned. then why was it banned. ask for a solution what to do to get it unbanned. crypto currency is nothing strange your coins come from anywhere will not be questioned. the solution is just above that contact the CS exchanger. or use another exchanger if you want to cash out the crypto you have into fiat money. via p2p or sell directly to crypto users where you live.
Just so you know — there have been a decent number of posts here on Bitcointalk and other crypto-communities concerning their CEX accounts being banned because of them mixing/CJing their coins. There have been several exchanges that have already spoken about this as well.