Incorrect repair creates my loss - Hisense blames me.

I purchased a Hisense double door fridge in October 2024, the fridge stopped cooling, I contacted the store and was informed to contact Hisense directly. Booked a repair. Tech came out, said the PC board was faulty. New PC Board was ordered. Tech came back with the incorrect PC board. Tech came out a third time, replaced the PC board the Friday morning stating all was working and in order. We left the Friday morning after the repair. On our return the Sunday evening we found the fridge had electricity but was not cooling. All meat (groceries) and meat from a hunting trip was spoiled. This is a qualified Hisense tech the replaced the necessary and confirmed all was working and in order, now Hisense says it is my fault as there was a delay in the repair. they ordered the incorrect part, my fault?? they replaced the necessary the fridge didn't cool and we incurred the loss of our entire freezer contents, there official letter confirms it was our fault!!! How is this my fault. Repair done, expected the fridge to work, it didn't that being said it was only 7 months old. now the loss caused is not covered by them. DISAPPOINTED BEYOND WORDS!!