So, your friend stole money, and they want it back. Under no interpretation is this extortion.

Yes, but cheaper to just contest the charge with your bank.

No. Just as if they provided lawn service and opted to mow your own lawn, you still pay.

No lawyer on this free site is going to do the research required to answer that. You need to retain an attorney to do the appropriate research.

I assume they have a different version of events. Yes, they can sue. If they do, retain counsel.

A lawsuit against Walmart is going to cost more than the four tires. Contest it on your credit card.

I would recommend doing nothing. A court doesn't want to discuss hair styles.

As per your terms of service, you cannot sue them.

No, that is distribution of child pornography...........

Yes this all sounds legal. You were knowingly driving without a valid tag.