Hisense not responding to my fridge problems

i bought a Hisense fridge around October 2018. it started making a funny unusual noise a year later or so. i logged a call for it then hisense did not come at all. luckily it stopped making that funny noise. now the fridge is not cold enough the things in the deep freezer don't freeze. Food rots in the fridge. i logged a call 13 December 2021. Their personnel came to check the fridge on the 16 December 2021. they changed the settings and said i should monitor the fridge. On the 17 December 2021 i called the technician to say there hasn't been any changes. He said he would come the 18nth or 19nth December 2021. He never showed up. i called Hisense again on Monday 20 December 2021 they said the technician would call me to come and fix it. to this day 23 December 2021 my fridge is not working its Christmas time i cannot buy food to enjoy with my family. my fridge is not working.