My 2012 Samsung RF263AEPN refrigerator feels much warmer than 34 degrees

I have a Samsung RF263AEPN model refrigerator that was purchased in 2012. I has not been keeping the refrigerator cool despite the 34 degrees display reading. I removed the perishable foods before going on vacation and came back about 10 days later. Still not cool. I noticed ice on the vents in back panels and in slots in the shelving unit. I placed it in “OF” mode last night. This morning there was water in the deli bin and under the bin. I cleaned up the water and placed the frig in 34 degrees temp, but did not hear any noise. I kept it on for about five minutes while I continued to remove the water and the temp inside slowly changed from 34 to 37. I placed the frig back on “OF” mode. When I get home tonight it will be on “OF” mode, despite that five minute interval, for 20 hours. Hopefully, every bit of ice has melted. I hope it solves the problem.