Telkom mobile doesn't reply to one's cancellation request

Our contract (2x) expired on the 20th of January. Apparently it went on as a month to month contract. But since the coverage is very bad in the area we live, we don't want to keep any contract with Telkom. It does perform well, as long as you live in Cape Town. But away from that. Lots of time it keeps dialing, it scrambles, or breaks up...

I had to fill in a cancellation form. Which I did. on January the 31st I sent it back to the cancellations department and the lady at customer service. So far I haven't received any feedback from any department from Telkom(mobile). On the 7th of February I sent an email to the lady from customer service and to the cancellations department. GUESS what!?! I got a message from the mail server stating they couldn't deliver the email to the cancellations department since their mailbox was FULL. I tried to resend it. I received the same message . Yesterday morning (the 7th) I phoned customer services explained what was going on and the girl asked me to send it to her direct email address. Which I did. Haven't had any reply, confirmation NOTHING! If the contract isn't cancelled I can't keep my cell phone number, which I want to keep because I have had this one for the last 13 years. Telkom needs to give consent (or something) for that number transfer.