Virginia/Owner Represenative/General Contractor Release Concerns

Hi I am the owner representative on a med-large size condo renovation. Prior to my entrance at the request of the owners, they had paid their very inexperienced GC approximately 70% of the contract and they had only completed approximately 29% of the work. Upon my arrival, I immediately began to require all of the paperwork that would be required during the normal course of any construction job. Including lien releases from the GC and all subcontractors. The GC had been working with us and had requested additional payments (still overpaid) for contract change orders that he had not previously billed for, but needed to be reimbursed. He is refusing to provide the lien releases from anyone and expects payment in full to go to him (no joint checks, but also will not provide progress releases from his subs) Is there anywhere in VA Construction law that prohibits the use of Conditional Progress Releases Upon Payment and Unconditional Progress Releases for work that is already completed? Thanks