Airtel — deduction o[censored]nwanted money

Address:

Chennai, Tamil Nadu, 600116

I had recieved a message from airtel stating that rs. 20 is deducted for primezone from my prepaid mobile account. I was watching youtube on my phone when the notification appeared. I immediately called airtel customer care and after 5 minutes was connected with a lady named cinepriya c who told me that i had opened and played a game and hence the charges.
When i told her that i hadn't opened any gaming site/ link, she was just rude and told me that the fault was in my phone and that the 20 rs was a one time charge and i won't be charged if i don't play the game in the future. When i asked her what the game was and how i got charged when i did not open anything she was just irresponsible and told me to go to a shop nearby and resolve the issue.
Airtel has to stop playing its games.
Investigate the matter.