Chinese seller stole my product

I have a unique product that I created. I have a copyright in process but it has not been granted yet. A Chinese seller copied my design to a tee and is selling it as their own. I bought a copy of their item and it’s my product exactly. I had Amazon pull the listing, but they filed a counter claim to reinstate it. I have to file a lawsuit in the next 10 biz days or their listing will come back. I obviously should speak to a lawyer, but wanting to know if others have been down this path? Are there any lawyers that specialize in Amazon infringement issues? I know Amazon has some recommended lawyers. Is it worth it to file a suit or will the seller just pop up again with another account? Don’t want to be spending tons of money chasing them like Whack-A-Me.