No air blow and all 3 light.

So my refrigerator is completely broken with the cold air switch not functioning and the lights don’t work. The cold air functions a little only when i turn it off but when i put it on low-medium-high setting, it completely does not work. The three lights do not work but the light bulbs are brand new. To resolve this, i replaced the bi-metal defroster and defrost timer for the refrigerator. But the results are the same and my refrigerator is still broken. Any suggestions as to how i can fix this?