defy ceramic hob

I brought the defy ceramic hob on the 16/12/2021 at Makro and I only installed it last year September 2022 ,January 2023 the hob started overheating and when u switch on on the plug the stove becomes on without pressing the buttons to control it than my glass cracked I had to take the stove back to the shop where they assigned the technician to come and check what was the cause for the stove to overheat and heck the size were the stove was installed he came and checked the measurements and said the sizes where correct he will send the report to his manager since from than I haven't heard anything from the defy until I called them today and they are now telling me the measurements are wrong and the glass has cracked they cant help me meaning while the case for the glass to crack it because the stove was overheating and that the reason they sent out the technician to come and check the size were the stove was installed is correct which the technician said it was correct to me but the report says another thing really now I have only used this product for 4 months only and payed for not to get help.