Police in Southampton, Eastleigh and the New Forest area are warning people about a bank card cam after a number of incidents.
The scammers tried at least 5 times on Monday to carry out their con and on one occasion they were successful.
In each case a person received a call from someone pretending to be from the police saying they had been victims of fraud.
They then tried to get personal information out of them including bank details.
In one case a woman from Shirley did as instructed and a man came to pick up the cards which were later used to withdraw £100 before the woman cancelled her cards.
Police are advising people to hang up if someone asks for their bank details or pin numbers.