As to Canada, I cannot say. But it the US, they can.

Review the coop rules and agreements to determine your rights and point out their responsibilities in a demand letter.

Probably ignoring the person is the best action. If it is causing true harm, an attorney demand letter may be effective.

This sounds like fraud, unfair business practices and other causes of action. They can be reported and sued. Before you report them discuss this...

Probably not but more facts are neeeded b

Yes it’s a solid case. Besides suing, you can contact the agency that licensees mechanics.

Contact, probably yes. But the parent is not responsible for the debt.

See if they have a website where you can sign on for your account.

While there are ways to approach this without an attorney, consulting with attorneys would be a good first step.

Arrest, no. But a judgment against you. Unless it is a subpoena.