Being billed for contract that expired.

In 2013 September month Telkom installed their line and supp**** me with 10GB Soft Cap as I requested. The contract was for 24 months, which was due to be expiring on the 2015 October Month end. When the time I called in and notified them that I will immigrating to MWEB Connections. I would remain only with the line for faxing and making calls. I also for my line to be upgraded to 4mbs. to my surprise I am being billed for the packages, that are expired. when I call in they tell me that my contact is ending on October therefore I signed it on 2014 October. Now my question to them is if I signed the contract on 2014 October why didn't you penalize me because its your policy and how can I sign a new contract where I'm still having a valid one with me. so I have logged in disputes but they ignored and no one is calling me to tell me what is going. I'm loosing money for something i'm not using at all. please help me I cant pay Mweb and Telkom for the same thing. <br> <br> Thank you<br> <br> James Tshipfiwa Mokoena<br> <br> ***<br>