A warning has been issued over scam calls claiming to be from Amazon Prime.
Victims have already lost more than £400,000 after following the instruction on the automated scam call.
The call tells the victim they have been charged for an Amazon Prime subscription. They are then told to press 1 on their handset to 'cancel the subscription'.
The criminal then tells the victim the Amazon Prime subscription was purchased fraudulently and that they need remote access to the victim's computer in order to fix a security flaw, LeicetershireLive reports.
The victim is then instructed to download an application called 'Team Viewer' and asked to long into their online banking account.
The software download gives the fraudster access to the victim's computer and allows them to see the victim's personal and financial details.
Other variations of the crime involve victims being told they are due a refund for an unauthorised transaction on their Amazon account.
Since the beginning of September, Action Fraud has received more than 200 reports from people who have lost money to the scam.
These victims have lost a total of £400,000.
They have also received more than 300 reports from people who received one of the scam calls, but did not follow the instructions.
Action Fraud is also reminding people to never install any software as a result of a cold call.
Pauline Smith, head of Action Fraud, said: "Unsolicited requests to remote access your computer should always raise a red flag.
"It's easy to feel embarrassed when faced with unexpected or complex conversations but its okay to stop the discussion if you do not feel in control of it.
"If you've received an unexpected phone call, or other communication, stop and take a minute to think about whether an organisation would get in touch with you out of the blue in this way.
"Instead, contact them directly using a known email or phone number."
If you are a victim of fraud of cyber crime, it can be reported to Action Fraud online or by calling 0300 1232040.
