Airtel — international roaming in usa

I got an international roaming pack for 30 days @3999 for my us visit and it was auto-renewed without my consent and intimation after 30 days. When i requested for this package before my travel i was not even told that it will be auto-renewed or i will be charged @649 per day after 30 days. When i found out i immediately deactivated it within 1-2 days of auto-renewal but was charged for a full month and after deactivation, airtel kept charging me @650 per day for following days. I have now received a bill of more than rs 11000 and i am not able to contact customer care also. The so-called toll-free numbers are fake. This is such harassment. I have sent an email at [protected]@airtel.com and hoping for a resolution.