We don't have a contract, I invoice each repair I do for them and charge by the hour. I have a flat rate I have given them on service repairs because they are all the same. I invoice them weekly. And yes, if they don't pay I have no choice but to cease all work.

My main question is, why would they be using bond as an excuse to hold up payment? Why would the surety pay subcontractors? Does that sound like a legitimate excuse?