No service at all from Defy

I have had a Defy Gemini Gourmet Multifunction Thermofan double oven for 12 years now. The thermostat of the top oven stopped working so that the oven is permanently on. The only way to switch it off and stop using electricity is to switch it off at the power. Which means we have to reset the clock every single time in order for the oven to work. I ordered the part from Defy spares centre in Bloemfontein in September 2021. I sent them a photo of the part,, the users manual and the front of the oven. They sent me the wrong part. I emailed them and after they insisted that it was the right part according to their info, After about 8 emails and resending the photos and they told me that the factory was closed as it was moving to new premises and would only be operational after 15 November. Since then I have sent them 6 emails with no reply . I went online to their website - defy.co.za - and sent a complaint to the customer service section on that site on 13 December. No reply I sent a second complaint on 24 January. No reply. They are totally ignoring me and our oven still does not work.