Puregold Virtual Card, Puregold Maypajo - Consumer Complaint for Puregold - Head Office

I presented my sister's puregold virtual card but the cashier didn't accepted it the fact that im not using the point but to only gain points and her supervisors as well. I often do this kind of transaction and this was the first time that my transaction was rejected. So im wondering if you guys are not accepting the usage of the virtual card, whats the purpose of its convinience? Thank you