Can't cancel contract

I have been trying to cancel my account with Telkom Mobile. I emailed them on [Email Removed] 4 days ago and have received no response. <br> <br> Today I phoned the call centre who gave me an alternative email address: [Email Removed] I email then both again and received mail delivery failure messages saying that the mail box is full on their side.<br> <br> When I phoned the call centre they said the only thing I can do is go in personally to cancel my account. They cant communicate with the cancellation/retention department to tell them that their mailbox is full and mails are being bounced back. Really?!?!