trying to cancell account

I have been trying to cancel my tekom subscriptions for the past two and a half weeks. Started off using the prescribed method of emailing the cacellation form to ********** . Everytime i tried, I got a response saying that "the recipient's mailbox is full." I then went to a telkom outlet where I was turned away as "they only deal with sales" and I was told to call. After calling the agent gave me her email, ********** and was told to send her the form. The next day I emailed her again as I had not received any notification regarding the cancellation of my line. She asked me for the account number which I promptly provided. I have not received anymore emails for a week now even though I have persistantly been emailing the agent. The response time and willingness to assist customers is absolutely shocking.