No response to multiple queries or cancellation

I have been with Autopage MTN for a number of years. I upgraded in January this year but when the upgrade kicked in I could no longer make phone calls. I contacted MTN who referred me to Autopage. I called Autopage who sent unbarring codes which didn't work. I tried contacting them via the website but received no response. After 2 weeks, I requested the upgrade to be reversed with a refund. The upgrade was cancelled but the billing wasn't adjusted nor was a credit passed or the phone service restored. I requested a refund, and a discount as I was not getting what I paid for and I ported the number to another service provider. I then advised via email that I wished to cancel the account completely, requested a progress report on my refunds and acknowledgement of receipt of my intention to cancel as well as a final statement of account. Again, I received no response. I have now received my March account where I have been charged for the upgraded contract and there are still no credits. I contacted the call centre today, they said they would raise a dispute on the Feb and March invoices but I have not received a reference number nor could they confirm cancellation of the account.