Note, You must respond in the legal way and on time with, for example a motion or an answer with affirmative defenses. Failure to do so could...

Consult with experienced debt collection defense attorneys in the state where this occurred. Many cities or counties have legal aid or other...

Depending on the facts it may be the best way to resolve the case. ◉

Check the court records as there must be a judgment against you.

There are consumer attorneys who frequently take in solar companies. Use the Avvo search tool to find an attorney. https://www.avvo.com/find-a-lawyer

You may have a case against them if the provided you a broken or defective product.

While it may or may not be a scam, such strong arm tactics are s sign you should be wary. ◉

It would be wise to not rely on the other side to take the proper action. ◉

Consult with attorneys in the state where this occurred. Many cities or counties have legal aid or other organizations that provide pro bono (free)...

Yes assuming the expert is willing. ◉