Still awaiting response for my refund.

I guess I've lost my patient. On 27th Feb, I spoken to an agent regarding the returning of my device for a refund (it was still within the 30 day money back period). So on the 5 of March, the courier came and collected it. They say they gonna review the device and refund me as it is still within 30days.

After the device was collected, I sent an email to you guys on the 16 March and I received an email reply from Sibusiso Sibisi on 18 March telling me it in process of being booked and it may take up to 21 working days. So I patiently waited, sent an email on the 29th of March and on 2nd April, NO RESPONSE.

I then wrote another email to you guys on the 4th of April and until today, it is still not responded.

Counting the days as of 4th of March, it already been 21 working days.

How long should I still wait and the non responsive support team is unacceptable.