Yes. They have done work for Trump under a contract. The work was completed and they asked for payment. Trump said he'd pay 30 cents on the dollar. The businesses told him to pay up the agreed-upon amount. Trump said to sue him and then tied up the case in court forever.
He's done it over and over and over again.
In this case, Trump cut off aid to the Ukraine - just to show that he could. Then he made a phone call and asked for a favor. If you can't draw a line between those two events, you are so deep in denial that he could literally shoot someone in Times Square and get away with it because nothing would ever rise to the level of proof to you.