have you ever been bothered by unknown telegram group ?
Suddenly added by unknown persons to unknown groups, made yours phone ring frequently and drain your phone battery
.
Some of you might think this is a minor issue. just by press
REPORT SPAM AND LEAVE. That useful only for few groups and it’s a short term solution.
What if there are 15 groups? your fingers will be dancing on the phone only for press
REPORT SPAM AND LEAVE 
The solution is ?
1. Go to Setting on your Telegram via handphone Only (not available in web version)
2. Go to Privacy and Security
3. Click Groups, default setting is Everybody (this is the trouble maker)
4. Set to My Contacts (the only other choice)
Lets check the pictures for details :
