Im a sub for a sub that did work on a government project on Nellis Air Force Base in Las Vegas Nv. The last day we worked was on was April 20th, 2019, the job was put on hold due to mold being found in the dorms . We were originally supposed to just open the fire chases and walls to give the plumber access to the cracked drain pipes and repair the opening, texture and paint to match. When we open up the fire chases we found that there was damage and holes in the walls that was done by some previous repairs, We were instructed to repair the damage and holes and to fire caulk all pipes, we were sent hand drawn drawings on how to do the repairs by Ellard Comstack who was the senior project manager at the time , i never got a change order, i just hand wrote a paper with the price and Ellard signed it as a letter of intent and I just last month went to Tuscan to get a statement from him that says Yes he did tell me to do the work. The job has now been cancelled and it will be rewritten and will have to be rebid, Northcon was not asked to return to bid that job and we instead were asked, Northcon now refuses to pay us, they owe us 58,000.00 for the extra work. They have been paid in full . What can we do ?