Thanks for your question
What do you mean by the right side thermostat is not working.
Whats the problem with the fridge
Turn that setting to the lowest number .
It should open a baffle between the freezer and the fridge to let in more cold air.
Set there and leave it for 24 hrs to cycle
The right dial says #6 as coldest setting for the freezer.
It closes a door from the freezer to the fridge
So real cold fridge at # XXXXX
Yes thats fine
Let me know how it ends up
Your freezer unit keeps frosting up Right.
Whats with the fork was the door froozen shut
You could start by replacing the defrost thermostat .Here it is here
Its a cheap part to replace
Too bad you had to buy a new one