Vodacom delay cancelation

Two of my lines is due for early upgrade. I went to look at what was available at Vodacom. I requested to have the same phone as what I upgraded my wife to at Cell C. I was told that they cant give me a dual sim phone because Vodacom locks the second sim function. So Vodacom expects you to pay the same price for a phone as at other provider but blocks it functions. I canceled my request for upgrades. After investigations I made the decision to to buy out the remainder of the two contracts. I paid for it yesterday afternoon and moved to Cell C. Vodacom then send me a message saying cancellation denied. Cell C phoned me and told me that they cant activate my sims as Vodacom has not released my numbers for portability. I phoned Vodacom and inquired why they have not canceled and made the numbers available for portability? Their responce simply is we can take 72 hours to cancel contracts. I was told to wait till back office phones me. I asked to be put through to back office and was told they dont deal with Customers.So why will they phone me? So I have canceled with Vodacom and payed the money immediatly but till they want to make the numbers available to Cell C..