Telegram update (v2.5.4) - how to remove Btcfoo.com Official User Group

[emerson]

Meizu MX 4 - Ubuntu 15.04 (r3).
Did the Telegram update to v2.5.4 today, and immediately afterwards had this Btcfoo.com Official group on display, many people entering this group permanently. I didn't add this group !
How do I get rid of this group ? Answering the dialog 'are you shure to leave this chat' with ok doesn't do anything. Sucks.

[advocatux]

@emerson edited your post to avoid linking that site

Anyway, I think your issue is not related to the latest update, just some random bot added your account to its spam list, and that can happen at any time.

Report that group on Telegram, and remove your account from it.