Translation of "Invoices" in French

Sami came across some unpaid invoices.

Sami est tombé sur des factures impayées.

What are all these invoices doing here?

Que font toutes ces factures ici ?

The subcontractors say that after they completed all required work according to construction specifications, Tom would either outright refuse to pay their invoices or would only pay them one-third of the amount they had billed.

Les sous-traitants disent qu'après avoir terminé tous les travaux requis conformément au cahier des charges, Tom aurait carrément refusé de payer leurs factures ou ne leur aurait payé qu'un tiers du montant qu'ils avaient facturé.