Aircel — Bill charged even after disconnecting the number

Respected Sir/Madam I had a aircel dongle with number [protected].I went to aircel franchise office in Bathinda regarding payment of my dues on 12-august-2013.I was told by the customer care executive to pay a bill of 450 rupees.I paid the bill and the receipt was given to me stating that "payment recieved and disconnection request".I got a email now on 14-may-2014 to pay 697 rupees.There was no usage of the dongle after 12-august-2013.I had clearly stated that the number be disconnected and the payment reciept recieved by me depicts the same. I was also given the contact number of Mr Gurmeet Singh Guru (phone-[protected]) to contact him regarding the matter.He told me to email the receipt.I emailed him the receipt on 15-may-2014.Today on 16-may-2014 i called on his number atleast 10 times.Every time i call it says that the number is busy.He has probably put my number on reject list and has stopped taking my calls. I request the fake charges of Rs697 that are charged against me for the month of September, October and November 2013 be dropped as I had already paid my dues on 12-august-2103 and requested for disconnection.The number was never used after 12-august-2013.The customer care had told me the number was not disconnected.It is not my fault if the company has not disconnected as I have a receipt clearly stating disconnection request and all the dues till 12-august-2013 were dulty paid by me. Thank You