False billing
Your business receives an unsolicited invoice for a service or product you did not request. This is another form of an assumptive sales technique used by scammers.
Means of contact
False billing scams are also based on the use of assumptive sales tactics, similar to those used in directory scams. For example you receive a call from a scammer posing as your regular office supply provider. They're calling to confirm your business address. Once you confirm the address, you receive supplies that you did not order along with an invoice.
Tactics used
Scammers use assumptive sales techniques to justify sending an order. They hope you won't bother to send it back and you'll simply accept the order. If you do receive unsolicited goods, send the company a registered letter requesting proof of the order. If there is no proof, notify the sender that you'll be keeping the supplies as a gift.