Airtel — for sms its deducting 3 rupees/sms

Address:

Bikaner, Rajasthan, 334001

I have regular problem from the last month that in my number its sending sms in the number of 54999818. For sms its deducting 3 rupees/sms. I spoken with airtel customercare and they didn't gave me any satisfactory resolution on this. This all happening without my knowledge. Kindly help me to solve the above problem and refund my more than 6 sms money which are deducted till now. Airtel no [protected]