Airtel — Wrongly charged for the service when the service was discountinued from AIrtle

Address:

Bangalore, Karnataka

Hi, I had international roaming activated on my number at a cost of Rs149 per month so that I can use the number when ever I am travelling. Airtel discontinued this plan of Rs149 and they changed the plan in the month of December but they have been charging my phone bill for Rs149 every month till the month of march. When I called them they are telling that this service is discontinued but I have to still pay for the service since I did not call them and discontinue the service. I asked them how will I know that service is discontinued and it is airtel responsibality to not charge my number.