Can i sue my employer and vendor for unpaid wages?

I worked as a software developer (contractor) for a client in Norwalk, CT for 7 weeks (02 Jan 2019 to 22 Feb 2019). I had various layers between my Employer and my client (Employer->Vender 1->Vender 2->PRIME-VENDER->Client). I was only supposed to be submitting my timesheets to PRIME-VENDER, but even after several requests PRIME-VENDER never gave me login details to their timesheet portal during this 7-week period & I never got a chance to submit my timesheet for approval. I still have access to my client work email address, several emails conversations with my client manager and colleagues. Due to these reasons, they never paid me a single penny for my 7 weeks work. After numerous attempts to reach my employer, PRIME-VENDER & other venders and request for payments, it still remains outstanding. When I tried to get in touch with Vendors, they don't provide me a concrete reason for not releasing the payment & blame one another. I have also sent an email notices to the vendors to take legal action against them if payments were not cleared, however I never got a response. I don't know how to deal with this situation. Could you please suggest any alternatives? Thanks