Problem fixed if Not solved. I recovered the 404a in the system. Drew a deep vacuum and gave a liquid recharge On the high side at 5.1 oz. Let it run for about 5 hours and found it at -10. Problem fixed but still Not Sure why temps Were off last time I charged it.
I can't See the photo but if your evaporator coil is top mounted it would likely have been damaged by a hammer. First make Sure the Compressor is running. Next Remove the panel over the evaporator Inside the freezer. Make Sure it has an even layer of Frost on it. If it is only partially frosted you may need a new freezer (evaporator coils are very $$$).