Vodacom running promotions that don’t work

I received 8 codes from Vodabucks rewards for 8 smoothies at Kuai. The 1st 4 codes worked but the remaining four were declined by Kuai. After calling Vodacom for 2 days they told me the codes will be re-activated which they were not. I was told the issue was was slated but then closed. I have called Vodacom every since since the 11th and they either say they don’t see it on the system or the rewards department should attend to it. I then was sent an sms by a Caroline from a Vodacom6 number saying they cannot escalate my queries because the codes have expired but they were purchased and attempted to be used long before the expiry date. I am now told to wait 2 weeks for “feedback” on the matter. This is disgusting customer service for a promotion that Vodacom runs which requires you to “pay” using your accumulated vodabucks and now my query is closed because the codes expired.