Non delivery of summer promotion vouchers.

I recently upgraded in store and was informed that the summer promotion vouchers would be sent to me within 7 - 10 working days. After this time, I went back to the store as I had not received them. After 20 minutes, during which I was twice asked if I had received the vouchers, I was given a reference number as the consultant informed me that the store was not responsible for handing out the vouchers and that a service request had been logged with Vodacom. Yesterday, I received an SMS saying that my service request had been resolved, yet I still do not have the vouchers. I called Vodacom help, was put through to the Upgrade department who informed me that I needed to query instore. When I told him that I had, he told me that I must go back to the store because it was the stores responsibility. Vodacom need to sort out their processes, ensure that everyone knows who is meant to do what and they need to send me the promised vouchers.