Refrigerator was 4 years old and out of stated warranty period
Refrigerator not sold to them by samsung or installed by samsung but by another party ("JB Hi-Fi").
Despite being out of warranty, family offered a refund - they declined it. An expert has called Samsungs behavior "concerning and unfair".
Notes:
Plenty of folks ignore almost all maintenance steps (cleaning coils, filter changes etc). Pulling the covers and looking around and cleaning even 1x per year would help longevity and catch problems earlier in many cases.
Having purchased appliances both personally and for a business - first call is usually to the store that sold us the item. These things are the one thing we get an extended warranty on.
The installers are absolutely not licensed plumbers or electricians! I wouldn't be surprised if a fair bit of damage is caused just in getting these items to their locations and installed. They are heavy and awkward.
Ask the repair tech who comes for first repair what most common issue is they are repairing - they often know right away (because they stock the parts etc etc). Some are avoidable / manageable.