I need my contracts cancelled

On the 29th of October 2014, I forwarded a notice to cancell my contracts on expiry, the same message was forwaded sometime in December, I also received two calls from your consultants and I made it clear I'm not interested in upgrading but want to migrate to pre-paid. Last Saturday I posted my complaint on your Facebook page, I was requested to inbox my contact details, that was done, yesterday another message was posted on your facebook page. How long do I have to wait until someone does something about my query?