Airtel — deducted 50 rs from my balance and automatically activated unwanted service.

Website:

www.airtel.in

On 22nd November, 50 Rs from my account is deducted and I got sms for activating some MHEALTH service for 1 week. I don't know what is this for and I was not even using my phone at that time. I connected with customer care and they said its an service activated from web, they don't have any information on this. But I havent activated this service. I dont need any such waste service. I need my money back. attaching screenshot of sms of deduction and service activation. Also my browser history says nothing browsed at that moment.