There are several postings on a few platforms about this issue.
Short summary for you: They took BTC/LTC after verification for the recently approved verifications. I don't think they will give it back, because they do not answer on tickets for this "issue".
If you had any other coins or USD you still have this balance, they just took BTC / LTC.
And yes, before my verification I saw my BTC balance that were still on wex.nz. They took it after the approval. So they have record of any coin.
reddit.com/r/wex/comments/74iam6/wex_verified_now_account_empty/
reddit.com/r/BTCE/comments/758slq/wexnz_account_empty_after_verified/
reddit.com/r/wex/comments/71iq4k/wex_verification/
bitcointalk.org/index.php?topic=2181023.msg22781133#msg22781133
https://twitter.com/langcaiye/status/917199390686593024