Hirsch's Springfield

On 19/08/2020 i purchased a Bosch HSB737357Z Free standing Gas/Electric stove from Hirsch's Homestore Springfield. It was delivered on 21/08/2020 to site. As building renovations were still underway, installation took place on 01/09/2020. This was undertaken by a registered gas installer and registered electricians. CoC's issued by both. I moved in on 14/9/2020 on completion of renovations. The Oven started tripping the main supply on 30/09/2020. This occurred when heating up to desired temperature. The building electricians attended on site 01/10 and confirmed that there was no fault in the electrical connection. Store contacted to arrange service call. Technician finally attend 07/10. No comprehensive electrical testing done, just that they would return with parts. 28/10 parts finally arrive and are fitted by technicians helper. brief testing done but no actual electrical testing done. Unit still tripping electrical supply and store informed. I have now only had contact from the store after posting on Twitter. Why must it come to this? Does Hirsch's Homestore not give a fig about after sales service? Always plenty of excuses.