Refridgerator freezing food
dm, I'm not sure if the thermostat is mechanical or electronic. Assuming mechanical...and I do...turn it to the lowest number...does it turn off? If this works properly, the problem is likely not the control. Does the compressor turn off at any time? If not after an hour or so of operation, the stat could be defective. That's my first guess. Oh, have you made sure that you don't have the ducts in the freezer blocked? The would deflect too much cold air to the fridge section.
Next, defrost the unit and clean the condenser coils. This will help the unit work properly. Then, wait awhile with the unit off. Meanwhile, access the compressor in the rear of the unit. Find the largest pipe coming out of the compressor. Turn the unit on. The largest pipe should frost and then, in about 5 minutes or so...either cause condensation or dry out. If neither happens and the line is either not COLD to the touch or frosty, you're low on gas. If the unit is less than 5 years old, you may get warranty coverage on the sealed unit from the mfgr. Believe it or not, too little gas will cause freezing in some cases!