Refrigerator side not getting cold enough

I assume that the freezer side is fine with this limited information. Check that the refrigerator temperature adjustment is properly set and check to see if there is air movement coming out of this adjustment opening. Also the opening may be blocked by something that someone placed there inadvertently.

Make sure both controls setting is in the middle not the coldest or the highest # that you think it'll get the refrigerator side colder it wouldn't.Let me know is there any ice forming on the back panel in the freezer side. If there is then the defrost element and the defrost thermostat have to be check.Hope is will help, God Bless