Vodacom Frontline and back office misaligned

On vodapay app, vodacom motivates that if you spend money you will get a coupon and R100 wallet. I spent as they advertised but they are failing to give me the promised coupon and wallet. I logged a call with them on the 26 of September. I got an email saying it was closed because they allocated them. I called them back to understand when it was allocated. The call centre cannot see any coupon allocated but back office said they did. Unfortunately I don't have numbers for the back office. Till today I'm still unhappy and not serviced