Dischem refusing to refund a double charge

Dischem South Africa and Dischem Canal Walk, your service has been utterly disgusting. We've tried for 4 weeks to get a refund after our POS transaction went through your system twice.

Your Canal Walk Manager, Charnay, acknowledged the overcharge on your system which was confirmed in the daily cash-up. We've been told multiple times that the refund has been approved and actioned, and 4 weeks later we sit with no refund and no answers.

The worst part is we have to continually phone to get feedback - it's incredibly poor customer service.