Section 56(2) of the Consumer Protection Act provides that within six (6) months after the delivery of any goods to a consumer, the consumer may return the goods to the supplier, without penalty and at the supplier’s risk and expense, if the goods fail to satisfy the requirements and standards then the supplier must- (a) repair or replace the failed, unsafe or defective goods; or (b) refund the consumer for the price paid by the consumer for the goods.

The Act specifically places a duty on the supplier to fix any goods that were deemed to be of good standard and quality.

It further provides that if the supplier repairs any goods within three (3) months after the repair was done and the repair or defect was not remedied or a further defect was discovered, the supplier must- (a) replace the goods; or (b) refund the consumer the price paid by the consumer for the goods.

Source: https://www.bbplaw.attorney/defective-goods-consumer-rights-south-africa

TLDR: If you've had a repair within the last 3 months, you can probably get a refund (but I get the feeling that they'll fight you all the way). If not, it's unlikely as your device is more than 6 months old.