Reducing harm to them.
WHAT CUSTOMERS SHOULD KNOW
Your official channels Which account payments go to That your details never change How to verify they are dealing with you
WHERE TO STATE IT
Your website Your invoices Your order confirmations
WHAT TO SAY
"Our bank details never change. If you receive a message asking you to pay a different account, call us on this number before paying."
WHY THAT MATTERS
It gives them a rule they can apply.
WHAT ELSE PROTECTS THEM
A site that ranks first for your name Verified profiles Consistent branding
WHAT TO DO IF A CUSTOMER IS DEFRAUDED IN YOUR NAME
Help them report it Warn other customers Report the impersonation Document it
WHAT NOT TO DO
Ignore it because it was not your fault
The reputational damage is yours regardless.
WHAT TO TELL THEM AFTERWARDS
What you have done and how to verify in future.