Standard Bank Mobile don't seem to be able to get a SIM activated

I signed up for Standard Bank Mobile thinking I'd get a good experience. Instead, I've gotten a SIM which they can't seem to activate. It shows as activated on their online portal, but when I put it in the phone, I get "SIM not provisioned". I've also requested to port my main number to this new SIM but that hasn't even started yet.

The call centre are ill prepared (not to mention the unnecessarily long voice prompts) to handle queries and I'm constantly put on hold. Eventually the blame was placed on Cell C. What is going on?