Consumer Redressal

I was subsribed to Airtel for the last about 10 yrs with mob no. 98807 04500. Of late due to their bad service, I opted to port the number to Vodafone.From 20th june\'13 Till the date of porting(1st week of july), Airtel has charged me an amount of Rs.174.30(deducted from my security deposit and balance refunded). However on my repeated requests through mails and phone calls to the customer care no. 98450 12345, Airtel is not providing me the bill. I can provide all mail copies sent and reply received from them so far. Since I had received an SMS mentioning that the bill amt was Rs. 125 and that they have deducted more and not supporting their claim with relevant bill, I seek redressal from this forum. Suresh