Bad service

I purchased a Whirlpool built-in microwave in April 2021 at Metro Lifestyle Centre. In October 2021, the microwave oven malfunction... This fault was registered as "insufficient heating". A technician was assigned to this job card and managed to do the repairs 3 weeks later. On 8 December I experienced the same fault again and contacted the call centre. To date the microwave has still not been repaired and am being sent from pillar to post. I was notified that the parts are available via sms but they have not sent out a technician to do the repairs.