Update#2
My character has been restored and everything seems to be ok. Thank you Octowow team.
Update#1
I've got an in game ticket response saying it was caused by a new bug and the character should be restored soon.
I got level 60 a few days ago with no announcement, i didn't really care that much and logged off.
A day later, i logged on and went to the dark portal to transfer. I got disconnected and my level 60 character is missing.