NO response to line cancellation

I visited a Telkom store to enquire about the procedures on how to cancel my Telkom line as well as my Internet service. I was told that can not do the cancellation in store but that I had to send and email requesting cancellation of my services. I have since sent the email with all that was required and to date have not had any response. I keep sending the email and now I get a notification that the mail box is full. It has been a month since I sent the first email. I would like my service cancelled.