Airtel / Prepaid mobile service
Unwanted service subscribe by co.and now not responding

As i had never subscribed JOKE service from Airtel (Prepaid service) Mobile

since last 6 to 7 month they deducted 30 rs. per month

i had contacted several time to customer care but they are not properly responding, neither they are stop my service

I am receiving the JOKE from 51818

and amt.deduct cut under AD54321

Every time they told no any service activated /but meanwhile cut the amt. everymonth

kindly provide the apropiate solution

i am not interested in any joke from airtel