Which are you using?
Me? I have accounts at:
HitBTC 5 post minimum to see code tags!
Binance 5 post minimum to see code tags!
Cryptopia 5 post minimum to see code tags!
Now a little about each.
HitBTC is a well known exchange that offers a lot of alt coins as well as BTC. I trade my AEON here
Binance is a trusted exchange that offers a lot of alt coins (they even have their own) as well as BTC. I sell my BTC here
Cryptopia is based in New Zeland and offers the most alt coins. I do my speculative buying of alt coins here.