Much Ad(un)o about everthing!

As a consumer, Adumo is the most frustrating loyalty card experience. I received a loaded gift card from Robertson Wines. (Thank you Robertson!) I tried using my card at a local corner shop and not one machine would accept it. Now I am trying to order via Takealot, because online research says my card can be used anywhere that accepts MasterCard. This is clearly not the case! Customer service emails take days to get proper, coherent answers, and the non-toll-free number is not available over weekends. What a crushing disappointment. What do I do now?