A Vendor Was Removed from a Company Due to Non-Performance

A vendor was removed from a company due to non-performance but continues to submit invoices for work that was not completed. Which of the following should the project manager do to stop the vendor from sending invoices?

A) Draft a C&D letter and send it to vendor.
B) Review the MOU with the vendor.
C) Ask the legal departments to draft a non-complete agreement for the vendor to sign.
D) Meet with the finance department to prevent the vendor from sending invoices.