Error with Vitality Move Vouchers

Hi there

So I enrolled in Vitality Move (*120*6683#) back in October 2018 and been getting rewards on my purchases at Pick n Pay, which is the good part.

Now, the problem is that I can't use the reward because every time I issue a new wiiCode and present it to the cashier, they get an error.

I requested for help last week Friday and only get an automatic reply yesterday (process number : ********** 032).

Please assist.