I'm not sure about the mekses but you can report it on Telegram. If you can, go to the police. I think the cybercrime team can handle things like that.

aw ketita mekses tchilaleh ! police tabiya hedeh bemamelket

Yes tichlaleh If he misused or shared your personal information with the public through his channel screenshot it keza you can show it to someone who knows law . They know what to do before you go to the police

Abuse@telegram.org