Airtel — wrong bill for my postpaid number

Address:

Mumbai City, Maharashtra, 400002

My airtel bill dated 6.9.17 for the period 5.8.17 to 4.9.17 was wrongly printed. I was charged rs. 357.72 extra in the bill for data usage. The bill was rs. 969.08. After speaking to customer care he said you can pay rs. 550 instead of 969 but no revised bill will be given. When i asked why, he said no system will not generate revised bill. I have attached the bill. Please refer the circled amount.