Cancellation of contract ignored

During January, I contacted Altech autopage to cancel my contract which had expired on +/- 19th December 2015 and to convert to prepaid. The call centre person advised me that I would have better call rates if I just migrated to a more economical package rather than going prepaid, which I agreed to. I queried when the new contract would come into effect and was advised the 17th February 2016, which I was satisfied about because I still had a lot of voice and data credit available on my voice contract. The migration took place on the 10th February 2016 and all my credit was cancelled ! I contacted the customer centre and said I wanted my credits reinstated until 16th February, which they ignored. I then reported on their online portal that I wanted to cancel both my voice contract and my data contract, I have a copy of my complaint and their response advising that they would terminate the data contract on 14th May 2016 and closing the call with no reference to the main complaint about my voice contract,<br>