How to use the non-normal way to recover stolen account?

I really want to get my account back because it was stolen.All game account information has been lost, so I can not use the normal way to get it back.I do not know who is stolen.And I do not know his IP.How can I get back?Please help me find a way to get back to my account.
Thank you very much.

email billingpp@nexon.net regarding your issue. They will block the account until you provide them the necessary information to verify you are the true owner of the account.

My account all information has been changed.But I did not change.There is no other way to retrieve it?
Another point, I said that a Chinese client.

Okay, but my number how can I get it?
Give up?

---------- Post added at 11:14 PM ---------- Previous post was at 11:13 PM ----------

My account

I am talking about is the account of the Chinese vindictus.so，how can i do.I do not know any information about the account.Because data thieves changed.