There were a lot of previous transactions on that address which i assume were successful? So i'm not sure why hey would selectively scam your current deposit when they could have scammed your previous 800 ETH or more deposits.

WEX has terrible customer support and you should know it. I mean ever since btc-e days their support is pretty much nothing. If you had an issue you had to wait for months.

At least you have proof that you should be credited. All you can do is be paitent really.