Samsung — Refrigerator

I purchased a samsung refrigerator back in 2019. Now for last 3 months it is constantly showing an error "84 C" So I contacted samsung to sort out this issue they changed the fan but the issue was not sorted despite multiple visits by their incompetent engineers. Moreover, after their 2nd visit the refrigerator was also not able to maintain the necessary temprature despite remaining turned on for a whole day. Bow after being unable to diagnose the problem now the company claims that I have taken assistance from a local engineer which led to the problem. This statement is totally false. Now, they are not even providing me the solution nor they are paying me for the damages instead telling me that it's my fault