Elderly and vulnerable people have been warned to be vigilant after a Bluewater card scam claimed seven victims over the past two weeks.

Victims are contacted by conmen who say they are calling from a store at the shopping centre.

They then claim that staff have stopped people suspected of using a bank card in the victim’s name and get details from the victims by asking security questions.

Instructions are given to the victim to either call their card issuer or police, but the bogus caller keeps the line open and pretend to be the bank to obtain the details needed to steal money.

In some cases victims have had their cash cards collected by courier.

In one scam, the conmen got away with £6,000.

Sergeant James Kay said: “These are elaborate scams which are made even more credible when phone calls are followed up by a visit from a courier who is expected.”

He added: “A bank should know your details and would never confiscate a victim’s cards or ask for PIN details under any circumstances.

"Before calling either the police or card issuer make sure the line has been cleared, preferably ring from another phone like a mobile.

"If this isn't possible ensure there is a dialling tone."

Contact Kent Police on 101 or Action Fraud on 0300 1232040 if you suspect any suspicious behaviour from either a telephone call or visit.