Airtel — Airtel not deactivating booster pack in postpaid connection

Sir,
I, nidhi kalani, am holding a postpaid airtel number of punjab circle. Two months back i activated an internet booster pack in airtel for 200rs and then deactivated in the next month. I also received the confirmation regarding the deactivation of the booster pack. But in the next billing cycle, i have been hard 350 rupees for that booster and i have tried emailing airtel, logging complaint, trying to reach 121/111 but i have not got any response from their end. Every month i'm forced to pay rs 350/- extra on my plan because the airtel service people are not deactivating the booster from my plan.
You are requested to immediately cancel the booster data pack from my postpaid plan otherwise i'll be forced to change over to a different service provider and file a complaint against airtel.
Regards,
Nidhi kalani

Kalani. Nidhi.[protected]@gmail.com