Cancelling MTN account for non service

So two and half weeks down and no service with a few emails to Farida Shaik and Shahim Sheik and I have had no response to sort this problem out. Received my MTN statement and Invoice and there again I have been billed twice for stuff. After being a customer for over 15 years, I have now decided that I am going to have to cancel my account. This is the thanks we get for being dedicated clients and not missing payments etc.