A warning has been issued to card holders following a new type of scam.
Fraudsters have been calling victims pretending they are from their bank or posing as police officers.
They say there has been suspicious activity on their account and they should hang up and dial the number on the back of their card to cancel it.
Scammers hold the line open so the victim thinks they are talking to their bank, but they are still talking to the fraudster who collects information including the victim's name, address, PIN and full bank details.
A courier is then sent with a fake new card and collects the old one, giving the scammers everything they need to use the card fraudulently.
Police advise people to end the call immediately. Card holders are also being asked to tell elderly or vulnerable people about the scam.
Between May and August, Thames Valley Police has received 17 reports of fraud of this type.
Call Action Fraud on 0300 1232040 or visit www.actionfraud.police.uk to report any suspicious calls or contact 999 in an emergency.
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