I lost 400$ on this site.
Sorry to hear that, but you should've paid more attention to its review section
[a lot of them were prior to its creation date (e.g. here's one)]!
Are we lacking of good exchanges that you're using a new exchange that has not proven its reputation in the market,
Considering that OP mentioned China, he/she is probably a Chinese national and because of the rules and regulations, their options are pretty limited.
Maybe the OP didn't know that all forms of crypto services have been discontinued in the country,
Legally, yes but there are still some underground operations for all kinds of crypto-related services in there and I'm going to lean towards the idea that OP thought he/she finally found a platform as a workaround.