They are ghosting me and my bill with the supplier is due.

I started a new deck project in a fairly nice area, I didn’t think I would have trouble getting paid with a small deposit in hand, especially since they had nice cars, I was sure they had the money. I ordered all the lumber for onsite and was 30% through when I gave them the second invoice for materials. It’s been three weeks. They are ghosting me and my bill with the supplier is due.”