An 82-year-old woman from Eastbourne has been conned into giving fraudsters £10,000 of her savings.
The lady, from Brand Road, was persuaded to transfer the money into another bank account in a heartless scam.
Sussex Police are warning that people are still being targeted by telephone and courier fraud.
However, more and more people are coming wise to these scams and are not allowing the fraudsters to deceive them.
Out of 24 people who have reported being called by the scammers on March 3, just one person handed over any money.
Detective Inspector Gill Sole said, “The message is getting out there that this type of call is a scam but we want to make sure that nobody falls victim to this.
“Police and banks would never phone like this and ask for personal details about bank accounts, pin numbers or ask for money to be withdrawn.
“If anyone calls claiming to be a police officer and asks you to check the suspicious behaviour with your bank, make sure the line is clear by making the call a significant time later or better still using a different phone.
“I urge anyone reading or hearing this message to pass it on to any friends and relatives who may not be aware of this particular type of targeted fraud, to prevent any vulnerable friends or family members from becoming victims.
“If you have any information, whether you have received similar calls or know someone who has been a victim of this crime, contact Sussex Police via 101 or email firstname.lastname@example.org quoting Operation Edisto. You can also call the independent charity Crimestoppers anonymously on 0800 555 111.”
For advice on fraud prevention, go to www.sussex.police.uk/help-centre/ask-us/fraud,-scams-and-financial-issues/what-can-i-do-to-prevent-fraud