Never mind service, just respond!

I opened a 2nd account for my mom +/- 5 years ago. Suffering dementia, she couldn't manage an account, but needed a phone. She died 31 Aug '15, the account in my name. I called MTN for a quote on the cheapest option: either early termination, or a downgraded contract. No feedback, called again. This time, after talking to about five different agents, I was sent to Legal, where I was told to send a copy of my ID and my mom's death certificate and they would cancel the contract, no problem. Gratefully, I did so. Response: I could definitely NOT terminate the contract as it was in my name. I called 808 again for a quote, they said I had to go to a store. I did that and told them the debit order needed to change as my mom's account would be closed. I got a ref number, no response to my emails. I wrote on their FB wall, four times, eventually got a response. Then nothing. I begged via DM for service, no response. My requests to change the debit order resulted in emails to say that my request is cancelled, twice. I requested the downgrade on 01 Oct, the debit will bounce in the next month or two. My request: quote on cheapest option, that option implemented as of 1/10/15 + debit changed