Use their chat to contact dominikherzog and tell him to look at your tickets. This is just a suggestion, I don't know if it will work or not.
Some complainant tried it already and unfortunately it's no use.
guys i realy need youre help plzzz. on date 20 i send 6353 xby froom my windows wallet to yobit which never arrive.
If it was sent that's basically on the network already and it's just delay, you know yobit is the most popular exchange for having this type of issue. Why you deposited there if you are on cryptopia already?