We have a project that we will be billing 2 times on. One is a progress billing (already billed on 12/22/17), and one is a final billing (to be billed once completed). For the progress billing that we sent on 12/22/17, the GC only paid 20% of what we billed. We billed $23,790, as we completed 67% of our project, and a change order. The GC required us to provide releases from our suppliers as well. They sent us a payment in the amount of $5,238, when we billed $23,790. Of the $5,238, they paid our supplier in full (approx $2,100), and we received the difference of approximately ~$3,100, for a job we are 67% completed with AND a completed change order. We are approaching 90 days on 3/22/18, since we first billed, and have not received any further payments. Since we are not completed with the job, (we still have 1/3 to complete/nor do they know when they will be ready for us to get in to do the remaining work), do we have any remedy to be paid on our progress billing? Thanks!