As the GC, we paid a subcontractor for an invoice, in full, and subsequently terminated their contract, but we have never received an "Unconditional Waiver" from them. What do we do if one is never sent?
More information is needed, but did you get a conditional waiver? Are you expecting a claim from them due to the termination? There may not be much you can do at this point, but it really depends on all of the facts and circumstances. I'd encourage you to consult with a construction attorney to discuss your specific situation.