First, it sounds as if you did everything by the book. Second, it sounds as if the flipper was trying to scam you. We you rejected his counteroffer, there was no longer any valid offer on the table. When the vlipper came back to you with the original offer, you were not obligated to accept his offer, since you rejected the counteroffer.
For some reason, I really don't believe this flipper is going to cloud your title. He knows he has no right to do so. But, to answer your question, if he clouds your title or theathens to cloud your title, you can tell him that you will take court action to Quiet Title and he will be responsible for your legal fees when you prevail. A Quite Title action can help clear up issues on a property's title. You can also tell them that, if you prevail and he doesn't pay your legal fees, you will file a Lis Pendens on one of his flipped properties. With a Lis Pendens, the flipper will be uanble to sell his property without paying you off. This will get his attention.
Answered on Feb 07th, 2021 at 11:58 AM