I also bought some coins on coinexchange and sent them to cryptopia. On coinexchange it shows as completed, but when I look up the hash I always get an error. Furthermore the coin also did not get deposited into my cryptopia account.

Hash is: d7a8de6e3d7daa76f413cf6c4409d9d9bf35d509b1933496ae0500eb322d6971

Whats going on here and who's fault is it? How do I get these coins back?

You very lucky.
My account still unverified, I submit many tickets already, 16 days left and no response. I don't Know when my account can withdraw my bitcoin?
Thanks