Airtel — deactivate permanently this recurring service

I have never activated these services but time to time MVN games and Games Arena gets activated in my number and money is getying deducted on a regular basis. Rs 35 got deducted today. I want to deactivate these unwanted annoying services permanently and get my money back.I got the message given below:

GAME ARENA service has been activated @ Rs35.0 for 7day(s).Txn ID Sxxxxxxxxx, 02Jul18 03:56. Service will be renewed after validity expiry.To use, click http://bit.ly/2yeIAGy (data charges apply).To deactivate, call or SMS STOP to 155223. More services? Call 56789