Do I have a case for damages?

I agree with Mr. Fanchy. No mechanic is going to replace a compressor without checking it themselves. The fact that he did so defeats a claim IMO.

He can go to jail if you do...........

If the police are investigating a case they can talk to any potential witnesses.

I was injured going down the garage stairs of my homes and had to get 2 stitches and a tenant shot what can I do ?

It depends on why you fell. I am a klutz and fall oftentimes with no other cause than me being a klutz.

Given the size of the investment, it is well worth having a local attorney review the entire contract and discuss with you.

You are asking us who to believe, and we can't do that. If you go to another Walmart, and are arrested, it will sort itself out in court.

It depends on whether the attorney has done work on the case.

You do not "file" a POA. It is given to you by a competent adult. If the adult is not competent, you must seek guardianship.

First off, it is a scam. Second, if it isn't a scam, you are committing a crime.

What do I have to do if the accusation is a lie?

I really don't know what you are asking. But if you are contacted by police, do not make any statements and retain an attorney.