Cancellation of account

I have been trying to cancel our companies Telkom account for the last 2weeks!!! I sent a cancellation letter via email twice and got NO response! I phoned the call centre and every time they put me through to the Business cancellation department I hold on forever and then I got cut off.... We wanted to cancel the account the beginning of July because we didn't want to get a bill for July and NOW it is almost the end of July which means we are going to get a bill again BECAUSE Telkom is to useless to answer phones and read their emails!! I just phoned the Telkom call centre again and spoke to Pricilla who informed me that no letter has been received on their system on our company's profile. She confirmed that the email address that I sent all my emails to was correct: [Email Removed] which means Telkom must be having a big problem.