The controls shouldnt both be turned to high. If u have 2 controls 1 has an "off" position and the other doesnt. do not turn up the 1 that doesnt, that is the damper door to the Ref and turning it up closes that door...
Then look into the freezer and see if their is snow/frost on the back wall.......if their is post the model number or a pic and ill see whats up..
If no frost then ck to make sure the frezzer fan is blowing, some cut off when u open the door some dont. either way if its not working take it down and see if something may be on the blade, ice, debris,etc if not u may have a bad motor.
If none of these is the prob ck the temp in the freezer with a -0 thermometer...leave it shut at least an hour, temp should be 0 or below....if its say +10 you really wont notice the differance in the frezzer but a refrigerator 10 warmer u will notice right off.....This will probably be refrigeration problems and if its less than a few years old get a repairman, older than that junk it...