Fake Unpaid Invoice Scams via Phone Calls
Callers chase payment for invoices a business never agreed to, using pressure and false familiarity to extract money for goods or services never ordered.
Part of: Fake Unpaid Invoice Scams
Last reviewed: 1 June 2026
A phone call gives a fake unpaid invoice scam an aggressive, personal edge. A caller chasing an overdue payment can fluster staff into paying simply to make the problem go away, especially when the amount is modest and the caller sounds confident and official.
The caller may reference a supposed prior order or a colleague to imply the debt is genuine. The live conversation pressures the target to resolve the matter immediately, discouraging the checks that would reveal no such order was ever placed.
How this scam works on Phone calls
The caller phones the business claiming an invoice is overdue for goods or services such as supplies, advertising, or a listing. They may name a colleague who supposedly placed the order or assert that delivery already occurred.
They apply pressure, warning of late fees, credit consequences, or service disruption unless payment is made promptly, and offer to take card details on the call. The claimed order is vague and cannot be matched to any genuine record.
If staff pay to avoid the threatened consequences, the money funds the fraudster for something never ordered. The scam may continue with further calls chasing additional invented invoices.
Common red flags
- A call chasing payment for an order no one can confirm
- Claims that a named colleague authorised the purchase
- Threats of late fees, credit harm, or service disruption
- Pressure to pay by card during the call
- Vague descriptions of the supposed goods or services
- No purchase order or delivery record to match the claim
How to protect yourself
- Never pay an invoice over the phone without matching it to a record
- Verify with the colleague supposedly responsible for the order
- Ask for written details and check them against purchase orders
- Do not give card details to an unsolicited debt-collection caller
- Treat pressure and threats as signs of a likely scam
- Confirm the supplier through independent registration records
How to report it
- Report the call to your national consumer protection or fraud body
- Notify your bank if a payment was made
- Record the caller's number and claims for your finance team
Frequently asked questions
A caller insists we owe for an order and wants card payment now. Should we pay?
No. Do not pay over the phone for an invoice you cannot match to a genuine order and delivery. Ask for written details, check with the colleague supposedly responsible, and treat pressure and threats as warning signs of a scam.