Vodacoms offers are *****ulent!

I upgraded my account in August, and part of the upgrade was R7500 in vouchers, which I was promised I would receive in October. I have phoned several times and first was told the vouchers were definitely part of the deal, but each time I check with the voucher company, they have no record of vouchers for my upgrade. Today, I phoned Vodacom customer services and was told there are NO vouchers associated with my upgrade! On the three occasions, I called Vodacom, I was promised a manager would phone me back to resolve this, but to date, I never received a callback. So clearly, this was not a real offer to start with, and Vodacom now uses ***** as a means to retain customers. I can't believe a company like this can continue to operate without any consequences, and judging from all the other ratings and complaints, it is clear they treat many of their customers poorly, and their customer service system is *******! Taking all my business elsewhere.