Refrigerator nor freezer was not. Refrigerator nor freezer was not getting cool enough. We have a

Question

Refrigerator nor freezer was not getting cool enough. We have a side by side refrigerator. Last night we cleaned the freezer and saw there was built up ice inside at back..it is a self defrosting fridge..we removed the ice by using a blow dryer..and we also vaccumed the back underneath. Today it still is not getting cold nor is the ice cream in the freezer ...freezing.