People in Watford are being warned not to hand over personal details on the phone to callers who claim to work for Watford Borough Council.
The caller tells the resident they have credit on their account and asks for debit card details.
A WBC spokesman said: “We are advising Watford residents to be wary and to never give or confirm any personal details over the phone
Please help us to spread this message and tell your family and friends.
If you have been a victim of a scam or to report a scam, contact Action Fraud (UK’s National Fraud Office) on 0300 123 2040.