You're running a huge risk trading on a platform that does not do business directly with a regulated bank. It may be fun and all, and perhaps profitable if you're a decent trader, but without regulatory oversight these types of exchanges answer to no one and therefore can do whatever the hell they please with your money.
I've never had any issues trading on unregulated exchanges, though I've read other people have. It wasn't a ton of money I lost, but it was a few hundred and that isn't nothing. Needless to say, I've lost all faith in Cryptopia and will be recommending against using it to all my friends and family. I cannot believe that they actually can't respond to support, I think they are just hoping I'll go away.