It is likely too late depending on when the last payment was made.

Yes they can sue in the US. It is possible since it is a foreign student loan it may be dischargeable in bankruptcy.

Discuss your situation with a bankruptcy attorney.

Until your tax refund is deposited, it cannot be levied.

Unless you can show you were not served, it may be too late to put forth your defense if they already obtained a judgment. Look into a motion to...

Yes it’s a potential malpractice case.

You may be able to win a lawsuit if they cannot prove you owe the debt.

It may be a scam. Whenever one is unsure, give no information, demand proof in writing (do not give your address or other information),...

The attorney might have violated the law. Consult with experienced debt collection defense attorneys in the state where this occurred.

Consult with tax attorney’s in NJ Use the Avvo search tool to find an attorney. https://www.avvo.com/find-a-lawyer