Paying for no signal, cannot cancel contract!

I have been paying for a service I have not been receiving. I have not had signal in moths, when I do have signal I consider it a good call if it only drops a few times.<br> Thank goodness there have been no emergencies that I really needed to use my phone. But I have missed many important calls and have been unable to make any important calls at appropriate times- sometimes having to ask other people to use their mobile phones if I am desperate.<br> <br> Now that I am trying to cancel my contract, which is due for an upgrade I am getting no response what so ever from Telkom mobile. I have sent over 15 e-mails with the cancellation details and I have yet to receive any feedback saying that it has even been received. I have taken a new contract out with another service provider in the meantime and I refuse to pay two accounts. One to Telkom, with whom I have been trying to cancel since the 9th of September, and my new service provider. This contract must be cancelled now, and in all honesty I would like my money back for all teh months I have had no signal.