Airtel
Balance Deduction

Sir

I activated GPRS plan of Rs 22 which gave me 350mb of browsing for 7 days on my mobile (9996051513). I browsed a little to check and it worked fine. But later when I browsed for a long time, I found that my balance was deducted by Rs 37 according to the old rate 30paise/20kb. When I called up customer care, their representative refused to explain and ended the call without satisfying me.