Airtel — Bill paid but not credited against mobile number

Address:

Bharti Airtel , Udyog Vihar Gurugram ( Haryana)

By mistake mobile of somebody else was mentioned while making payment of Rs 710.On informing Airtel they are not doing correction and are insisting to pay already paid money with next bill already issued.
Customer cars is hopeless and dies not care to resolve issue and is stating for last Ten day that resolution will take place in 24 to 48 hours .99107xxx39