Airtel — deduction of balance without using service

deactivation of m.igfun.com
i am from Delhi.my airtel preoaid number is [protected].
From 12th january morning i received message from 64611010.i am charged Rs 10 per day from 12th january though i did not subscribe for m.igfun.i called to airtel customer care.
as per reference number i am adviced to visit the above website and deactivate the service.but i dont even find any way to deativate the service.
kindly pay attention to my problem.