MTN Rewards fail

As a shareholder and long-time customer of MTN. I am very disappointed in the service. Especially the MyMTN Rewards system.

A few weeks ago I bought a R100 Debonairs voucher with my yellobucks. To date, I have not received the voucher. Following up with the call centre. They all but brighten up my day with the poor service. I was told to send an email to ***. Whether that email address exists I don't know as I have not received an acknowledgement since sending the email on 11/02/2021.