Fridge is not cooling
Sounds like you've hit one of the refrigerant lines, and let the magic juice out. This is a very common cause of refrigerator failure. Unfortunately, if it's even possible to repair the damage, it'll likely cost more for the repair than for a new fridge.  Of course that completely depends on the make and model of the unit, and how accessible the damaged section of tubing is.

Next time you want to defrost the freezer, follow the manufacturer's defrost procedure. Stabbing at the ice with pointy bits, is never a good idea.