Autopage does not want to release my number.

The cellphone number I am having a problem with is ***. This number has been on contract with Autopage since 1999. Over the past year, I have had numerous problems with the service of Autopage, to being treated rudely and having the phone put down on me when I requested to speak to a Supervisor or Manager. My contract came for upgrade a month ago, and I decided not to carry on with Autopage due to the lack of service as well as the frustration caused by your call centre. I requested to cancel my contract and put my number on prepaid. I was told that this can only be done in July. I requested for it to be done immediately and was informed that I will need to pay the 2-3 months subscription in advance which I had done. I sent through the proof of payment for the 2-3 months subscription. I sent through a request on my company letterhead that I wanted to cancel the contract and convert my number to prepaid so that I could carry it over to Vodacom directly. I sent my ID and basically, i Did everything that was requested from me. I also have proof that everything has been received at Autopage. It still hasnt been done!! I am trying to get hold of Hema Rajkumar who does not answer.