M.K.
I would not pay the sub but I would contact an attorney. I would want information from a professional legal rep. Often times we think common sense and logic would prevail but unfortunately, the law doesn't always work that way. Legally, the sub is entitled to payment and although I wouldn't pay him at this point, I would ask an attorney about the sub's rights and your responsibilities if the agent (the contractor) doesn't pay. Agent duties and obligations can be complicated when there is a third party involved (the sub). I obviously don't have the answer, but would present these questions to a professional to get them. Good luck. I agree with prior postings that you should have your receipts, canceled check, etc. and I would also keep a log of the phone calls to the contractor.