Defy warranty service poor performance

In 2019 I purchased a Defy Gemini Gourmet Oven from Game at Cresta Mall, Randburg. I also purchased an extended warranty for a further 5 years from 2019 to 2024. This was a cash deal for over R14000.00 On 26 January 2021 I reported to Game that when switching on the top oven, then the power trips. I called an electrian who checked the connections to the oven and the DB. This person stated that the oven was the problem. Game registered my issue with Defy Service department and I received a message stating that the technical fault had been registered and that a "Service Paper" number *** was allocated to this problem and that a technician shall be at our premesis on 8 February 2021 at 12h00. Needless to say nobody arrived. I telephoned the Defy National Service centre on *** to enquire. I was informed that the technician was allocated and shall be with us on 9 February 2021. No Defy technician arrived on 9 February 2021. On 10 February 2021 I telephoned the National Service Centre again was was informed that the technician was dispatched and shall be with us on 10 February, I phoned 3 times on 10 February during the course of the day and was told the same story. Nobody arrived on 10 February 2021. I then sent a complaint to Defy Customer service the evening of 10 February 2021 and has yet to receive a response. On 11 February 2021 at 08h53 I phoned the National Service Centre again to enquire about the technician and was assured the technician was disptached and shall arrive at our residence. I also enquired as to who was in charge of the technicians and was given the name of a Mr. Jan van Zyl on ***. I phoned several times on 11 February 2021 to try and speak to him but to no avail. I also left a message for him to return my call and at the writing of this review at 13h00 he has not returned my call. I thought of supporting RSA products but with this kind of very poor service and absolute lack of concern for customes, why support Defy?