Cancelling postpaid to move to prepaid

It's been a long day. Spent over on hour in a Vodacom shop to cancel my postpaid to prepaid. They could not assist me.<br> <br> I have been calling *** endlessly with no response for about 2 hours now. I finally get through and am told they cannot help me as I am on their new 3D billing system. THIS IS NOT MY PROBLEM. I want this resolved urgently!<br> <br> I am very disappointed with Vodacom right now. There is nothing world class about this company.