Frustrated

Bought a hisence fridge for my mom it is still within warranty period and this fridge is giving her problems (chiller not cooling) technicians came out 4 times already the problem only gets solved temporarily and then we back to where we were. The last technician came out Thursday 01February 2018 and hours later the problem still exists. I've been sending emails to customer service no response, my mom phoned on monday and they said they'll get back to her by Tuesday which they never did. Meanwhile we loosing perishable products on a daily basis and no one cares this is really frustrating!!