One solution is electric invoicing with digital signatures. For example there is the French Factur-X (known in Germany as ZUGFeRD), an invoice PDF with embedded XML data that can optionally be signed. That way if you receive the invoice you can check who signed it and if that's the same entity that supposedly issued the bill.
There is a lot of movement in that space right now because European governments use this data for VAT processing and have discovered that signed machine-readable data is a lot better than stacks of paper audited by humans
Another part of the solution is reporting such cases and making sure these people are charged with fraud
There is a lot of movement in that space right now because European governments use this data for VAT processing and have discovered that signed machine-readable data is a lot better than stacks of paper audited by humans
Another part of the solution is reporting such cases and making sure these people are charged with fraud