Poor Customer Service

I have a cell phone contract with MTN which has now reached and exceeded the agreed term of 24 months. No one from MTN contacted me for the termination of the contract. Two months ago I sent an email to [Email Removed] as I never got through on the 173 number. I did not get a response. Last month I sent another email and still did not get a response. Two weeks I went to the service centre at Bryanston Shopping Centre and was advised to contact 1808. The consultant I spoke to gave me the ref number *** and told me to expect a call from the Retentions Department, it is now two weeks and still no word. This morning when I called in I found that the call centre is closed. I cannot afford to have any more money taken from my account for something I do not use. This is by far the worst service I have ever received from a service provider. When will this contract be terminated???