BAD SERVICE - KAUAI HAASENDAL

I went to Kauai Haasendal, to order a wrap and a smoothie - first of all, I used my Discovery Miles points to buy a voucher, as Kauai and Discovery is partners. After showing the lady behind the till my barcode to scan for the discount, she said that she can't scan the code and that it does not work on the system. I then asked her how can it be possible, as this is the voucher I've just bought a few minutes ago. She then said that she needs another code on the app, but she does not know how the code looks? I then asked her how is that possible, there's only ONE barcode to scan for the discount. I even opened my discovery app to show her and asked her to show me which other code she is referring to, and still she didn't know? How is this possible to not even know a product that you are referring to? Needles to say, I've waited 950 of my Discovery Miles, because your staff isn't educated on the products, properly. HIGHLY DISSAPOINTED!