Heres the situation. My accounting department appears to have paid a vendor twice for the same work. Payments were for a labor only job. Payments were not made by check, but by ACH and wire transfer directly into the vendors bank account. This was done about 20 months ago. A recent audit has just uncovered the error. Vendor claims to have only been paid once, and says they do not have the additional monies, about 93K. This mistake is completely our companies fault, the banks did nothing wrong they moved the money as directed by us. What if anything can we do to attempt to recover this money? We have been still using this vendor for work and don't want to harm the relationship if possible.