Food in fridge freezing

My food is freezing in the fridge. There is only one thermostat that controls both the fridge and freezer. The vents are not blocked, icemaker works fine. I keep turning the thermostat one notch warmer, but food and drinks still freezing? Someone told me I should actually turn the thermostat to a colder setting, not warmer??? I can feel and hear airflow in both fridge and freezer.