Side by side fridge freezer

I have a 2 1/2 yr Samsung side by side fridge freezer exhibiting similar probs to owner of this type - it's condenser hums and two weeks back I lost freezer side cold temperature resulting in lost provisions -I have cleaned coils as recommended and its worked ok for 2 weeks. This model is a RS20 CCSV (no icemaker - digital diplay/control on freezer door)- problem seems intermittent. After a power cut yesterday the digital display seems to have swapped sides i.e. Temp on fridge side is displaying freezer range temp and vice versa. I switched the supply off again and waited 10 mins before reconnecting but to no effect. Display is currently reading -6 on Freezer side but when freezer temp button is pressed displays -23. Display on fridge side is currently reading 16 ?? !! but when fridge temp button is pressed displays 2 Both temp level pictorial displays have all bars lit. Freezer appears to be maintaining cold temp but fridge temp is suspect - nothing cold to the touch Would this be controller prob or condenser starter prob ? would really appreciate some help/guidance here please. As I'm nervous to load too many provisions into it at the moment - situated on South East Coast England if I need qualified repair service could you also please advise of competent Company to contact please as its out of warranty - locals won't touch it.