As you can see, this exchange has a shady reputation, its creators use plagiarism in their key documents. This is a sign that they are not very interested in the successful functioning of the exchange and the safety of customers. It is not a big surprise for me that losing money here is quite simple thing. I can advise you to collect the necessary material with proof that the deposit has been made, but now you do not have access to it.
Next, you need to create a topic using this template https://bitcointalk.org/index.php?topic=260073.0