Airtel — prepaid to postpaid migration no

Address:

Bhavnagar, Gujarat, 364240

Respected sir..
Last 14th sept i was visiting aairtel store and submit all bill amount of remaining at my no. And request for postpaid to prepaid my airtel no. Stiil not done and after that they demand my documents and i also sent to store bycourier service.
Still not doing they and talked with rudely and say do what ever your lavel...
It's not there fault.