Temperature adjustment. I have had trouble getting a good temperature. Vegetables froze; now

Question

I have had trouble getting a good temperature. Vegetables froze; now meats/dairy are going off before "use by" dates. Please confirm which is the colder setting, the low numbers (1, 2, etc.) or higher numbers, 4 or 5. Also, is temp. in freezer controlled by the same control dial as the fridge, i.e., the dial in the fridge itself? Thanks. Ron