Consumer Redressal

I have a MTS connection for data (through a dongle)which has not been working since May 1, 2013. On repeated complaints the same has not been corrected and the service is not restored at all. Bills are being raised by MTS for subsequent months while I have categorically said that if the service is not being restored, please disconnect my service. I have paid the last bill on 18th May, 2013 on the assurance that the service is disconnected, but the bills are still being sent, while the service is not delivered at all. Additionally, I have been threatened with legal action for non payment of bills. I have been constantly harnessed on my mobile phone with obscene messages from some people from MTS. I had purchased a data dongle (cost- Rs.3000) which is useless because MTS is not delivering the service. The amount of bills raised after the above is Rs.1820. I would like to file a complaint against MTS to withdraw the bills for the period service was not rendered and buyback my dongle.