Airtel AD 54321
Deducted 50 rs for nothing

I received this sms (dated 30th oct).

"Thanks for downloading Theme from Airtel. You have been charged Rs 50. Play Games at Re.1 http://203.115.112.5/GCLite "

I did not download anything from here! what the hell is this. I check my balance and i see 50 rupees deducted. can anyone resolve this.

Mobile no. 9903971007

Help is appreciated.