Lincolnshire Trading Standards is warning residents about a telephone-based holiday scam.
The deal involves a telephone call that informs recipients they have won a holiday in Florida or the Bahamas.
The caller tells the prize winner to press nine or call an 0800 number, but eventually they are informed that a £550 payment is needed before the holiday can be claimed.
Trading standards is advising people not to give out credit card details.
Jim Goodchild from Trading Standards said: "Our maxim is always - if it is too good to be true, it probably is."
He said the agency has already received several complaints about the scam.