Close this thread. It was my mistake.
Can you edit the title (you can do this by editing your first post) to reflect that Hhampuz is not the bad guy here? Some people don't read more than the title, so they shouldn't get the wrong idea.
However, I have never, and never will complete a transaction solely on Telegram.
I must admit I have completed several transactions through Telegram, but only with accounts owned by people I trust. And when it comes to payment, I usually say: "please check this link on Bitcointalk for my address" because I don't trust Telegram itself with Bitcoin addresses.