wage payment

My husband owns a computer software consulting firm in Texas. He has a contractor at a profitable company in Dallas. This client has not paid his consulting company in 4 months, therefore, the contractor does not get paid. A contract was signed stating the rate and length of the contract. The client's reason is that they cannot find the purchase order to cut a check. Repeated calls from the consulting company to the client has done nothing. The contractor continues to go to work everyday and his work is excellent. He has also been vocal about not being paid. According to everything I've read this contractor is actually an employee; he is given direction and controled by the client.

Should my husband's consulting company file a claim with TWC? Or should the consultant file the claim? Any other ideas?

Thanks so much