Airtel — Bill for earlier month paid but still added as outsranding in next month bill with late payment charges

Address:

Bharti Airtal , Vasant Kunj and at Udyog vihar Gurgaon

Bill paid in time but by mistake have mobile number of other .Later correct derails sent to company but hopeless customer care department is not resolving complaint and has added already paid charges to Feb bill with late payment charges .Dont want to resolve and want to harras customer by not resolving a small issue to make him pay amount already paid .
99107xxx39