I found a post of possible restored character by GM on a locked server.
If the warlock (Jynx) was speaking the truth, then I guess it’s a game of luck, and GMs indeed have the abilities to restore characters deleted on locked realms. I will try my luck and wait for the ticket response, if I get lucky and encounter a GM who would read my issue carefully and try to help me, I might get it restored. If that post was just trolling, well then bummer.