I am a general manager of an electrical subcontractor who signed a paid when paid contract. The project was completed and the GC is saying that they can only submit one last change order to the owner and they need to have all other subcontractors have their proposed change orders completed in order to submit. After three months I have followed up with email, phone calls and they have been non responsive. They are holding up us getting paid for our last CO and our retainage on the project which is 10% on a million dollar project. We think their retainage is only 5%. What can we do at this point to get paid?