Why is my freezer not cooling but my refrigerator is working fine?

Model# RF18A5101SR/AA

I have a 1 year old Samsung French 3 door refrigerator and the freezer is not cooling properly.

I noticed that my freezer was defrosting all my food and the temperature on the display panel was blinking. There were no error codes, just blinking -1.

I have reset the unit by unplugging it and waiting 30 seconds, and plugging it back in. I looked at the temperature when I plugged it back in and my fridge was at 45 and my freezer was at 64. I put in the suggested temperature 39 and -2, my fridge temperature went all the way down to 39, but my freezer is at 62, 24-hours later.

I’m not sure what else to do, can anyone help?