Bad communication from the cancelations department.

I tried to get information around how to cancel my contract because my contract is about 24 months in, by calling into the vodacom cancelations call line. I waited 15 minutes on the line and couldn't take it anymore. I then decided to send an email to the cancelations department but I have since waited with no response. Vodacom is very quick with upgrades and new contracts but when looking to make cancelation enquiries they do not answer you.