My aunt bought a fridge in 2019 and it has stoped working she had lost a proof of purchase because I mean this fridge was expensive to be broken with in 2 years

My aunt bought a fridge in 2019 and it has stoped working she had lost a proof of purchase because I mean this fridge was expensive to be broken with in 2 years.we asked them come and check they promised to send someone but they never did..she spent the whole weekend without a fridge