First check your freezer door gasket to make sure it is not damaged, cracked, and is making a good seal. I always set both controls to there middle position. Your refrigerator side will only be cold if the freezer side is working. Try rotating the freezer control in the opposite direction. It is not an electrical part, it just opens and closes a vent that let's air from the freezer side into the refrigerator side. When you set the control to it's coldest setting you may in fact be allowing too much cold air from the freezer into your refrigerator.
Look for a vent in your refrigerator coming from the freezer side and hold your hand over it, you should feel an airflow, now rotate the control the opposite way, if you feel less airflow you are closing the vent and the freezer should become colder.
There is a second control in the refrigerator side, which is the electrical thermostat, by rotating this to a lower, or warmer setting you should hear the refrigerator shut off. Turn it to a higher setting and the refrigerator should turn on.
"There is no such thing as a refrigerator, their are freezersí who share there cold air on a limited basis" It's there way of saying stay cool.