POOR SERVICE / FAILURE TO CANCEL CONTRACT

On 20 August 2015 I gave notice to cancel my MTN contract which expired on 17 September 2015. MTN confirmed receipt of my email and gave me a reference on 20.8.2015. On 4.09.2015 I received an email to find out if I want to cancel and keep the line on prepaid. I rep**** and said I just need it cancelled. I will not be using the number. I did not receive reply to my email. I followed up on 16.9. On 17.9 I phoned and spoke to Thuthukani who was rude, did not want to take my reference and told me the contract is not cancelled I need to give notice (which I already did). I tried explaining to him but he did not want to listen and at one stage told me to keep quite as he wants to speak. He was rude, unprofessional and very unhelpful. I did give notice for my contract to be cancelled and I want it cancelled. I wrote to customer care yesterday and have not had any reply.