Overdue refund is being ignored

It's been almost two months since I dropped off my modem at Web Africa, due to your extremely slow internet speed. I have received a credit note for R1999 but no refund has been processed. I have reached out 7 times on your live chat and given my Banking details, however still no refund has been made. I have followed up on email, but it seems like my mails are now also being ignored. I'm hoping we can engagement in some meaningful dialog here on Hello Peter in order to get this issue resolved.