Poor service / do no honor contractual agreements

I am in the process of switching to Cell C, but am starting to regret my decision. I entered into an agreement whereby Cell C will buy out my current cellular contract by means of a "voucher" card - this is to be loaded with the specified amount, which I can then use at my previous service provider to pay the early cancellation fee. The agreement is signed, the sim is swapped, once off charges are paid to Cell C, but the buy out card that is supposed to be loaded within 24 to 48 hours is STILL NOT LOADED - since last Friday, the 29th of April! Each time I phone I get the same answer - today or tomorrow, yet still nothing. I am extremely disappointed in Cell C and feel like a ****, as I have recommended them and their package (that I now have) to all of my friends. I have honored my side of the agreement, but Cell C has not. I am considering exercising my rights within the Consumer Protection Act as well as cancelling my contract with Cell C. I understand now why people put up banners on the sides of buildings about them and want to kick myself for not listening to the word of mouth about their horrible service.