Airtel — regarding billing issues

Address: Mumbai City, Maharashtra, 400072

I had discontnued airtel dongle and i had to clear the bill, inspite of going to airtel gallery and paying the overdue amount also!, airtel customer care executive named aarti and one of the other colleague and few more to be named called and spoke in a rude manner!.
They don't have courtesy nor records!
Nevertheless to say inspite of paying the bill they are behind you and calling you every now and then.
And before paying the bill they even said you pay the bill and then talk to the manager!!
Felt hurted, we also loose temper but they should be trained to deal with customers
(Clients)