Makro/Tevo not honouring faulty air fryer replacement

Ass. Number: *** I bought the Bennet Read 22l air fryer oven from Makro Centurion on 2/3/22. The temperature is not correct, if set on 250 deg, when tested it reaches only 180 deg. This was noticeable, as the food was still raw. I returned it to Makro Centurion on 13 April 22. I was told it has a '14-day cashback' policy, and they took it in for 'assessment' even though I told them that it was not according to the Consumer Protection Act. On 4 May I went to check, it is still not back. This is unacceptable. Then wrote to Makro HO, with my complaint. "I spoke to your manager and again referred him to the Consumer Protection Act, but all he would say is that he will follow up the return. " Of course I have not heard anything. Makro HO said they would investigate, and still nothing today. I went to Makro again, not back yet. I want a replacement immediately and without delay please. Kind regards Frank C Baker