Reliance Smart GSM — Reliance Smart GSM charged me approx. Rs.80 as false Roaming Charges

Address:

South 24 Parganas, West Bengal

On May 25, 2011, I had recharged with Rs. 100 in the morning and had called in one STD No. and to another Local Kolkata Reliance Smart GSM No., for local calls, I had activated Reliance-to-Reliance free calls of Rs. 199. Presently am staying in Durgapur and I had purchased the SIM from Kolkata. I was calling the same Local Kolkata Reliance Smart GSM No. for past 3 months from Durgapur only and they never charged single penny due to my activation of the offer.

But on May 25, 2011 night, the service provider had deducted approx. Rs. 80 from my account balance claiming that I was in Roaming Area, but on that day and that particular time, I was calling from Durgapur, from where I use to call or presently call to all Local Reliance Smart GSM Numbers everyday, they never charged me any penny, but that day, they claim that My Presence in that area as Roaming Zone.

For this reason I lodged a complaint (SR No.[protected] against this manipulation from the service provider on May 28, 2011 at 12:01PM. And on May 29, 2011 at 8:08PM, I got a sms that:
"Dear Reliance Customer As per SR[protected] for wrong charging of calls we had checked & found that all calls are charged correctly Thanks"

Now please suggest me, what should I do to get my money back and to prove that they had done a fraudulence against my Number.

Thanks & Regards
Daipayan