Unacceptable service by Game Greenacres

We bought a Defy stove in 2017 with an extended guarantee to 2022. During the stove has already been replaced once due to multiple defects. The new stove is now also broken. A technician was sent out to fit the faulty element and stove plate. 1 day later the entire oven and warmer drawer stopped working. We have contacted Game telephonically numerous times with no response. We have also been to the store about 10 times to report the matter and still nothing has been done. A complaint was lodged with the Extended guarantee manager at Greenacres, Tanya, as well as the Greenacres Store manager, Gordan, but they have done absolutely nothing! It has now been 2 weeks that they have promised that a technician will come out to fix the stove and still we wait. We are unable to use the oven at all. The service is unacceptable. This needs to be resolved immediately otherwise we will be contacting the ombudsman. This is ridiculous that a large store like Game cannot attend to a clients query.