Airtel — international roaming charge forced without my consent

Address:	560102
Website:	Airtel

My daughter a school student travelling abroad US between 20-30 April 2018 and I have taken basic Roaming service of 149 INR, customer care only explains this is a basic charge and certain data and voice usage will be applicable. In Day 1 20-April. as per Airtel they claimed the usage was 3000 INR and hence they over write it with 649 Package per day without sending any SMS or barring the number ro call as my credit limit for 2 numbers combined was only 3600 INR. After 30 April when my daughter is back, they send a SMS saying they barred the International roaming but charged 12 480 /- INR. So I think this unethical charge from Airtel to customer without my consent and they have not explained this during taking the IR service help. Need help and want this bill to be discounted for 10 days with 649 INR each day .. They already taken the money from the bank