[xzin0vich]

Hi I wanna know how to self delete his telegram account

[adjective]

Try to contact telegram support.

[boar]

Try this: https://my.telegram.org/auth?to=delete-account

[Darth_Vader]

Yep, what boar said is the solution.

Otherwise, if by 'his' you mean someone you know, you'll need to know someone at TG to get them banned. Reports from good standing accounts could also work. Never really tried it.