CONSUMERS and businesses are being advised to be wary if they receive phone calls out of the blue from callers claiming to represent IT suppliers.
The Office of Fair Trading has been contacted by people who have received calls saying their computers have a virus.
In these cases the caller claimed to be from Microsoft.
Following an initial chat the callers turned the conversation to how much they would charge to deal with the virus.
None of those contacted agreed to pay for the "repair service" however they could see how easy it would be to panic consumers into paying for the "service".
The OFT said that although legitimate companies may contact consumers by phone it is important to make checks on the company before agreeing to any services they offer.
A spokesman said: "Don't feel obliged to continue with the conversation - put the phone down.
"If you carry on with the call advise the caller that you do not wish to make an immediate decision.
"Tell them you will contact them should you decide to take up their offer.
"Ask for full contact details, including a telephone number. Be wary of a company which only provides a mobile phone number.
"Put the company's name into an internet search engine to see what you can find out but don't be fooled by professional looking websites as scammers are good at making their scams look authentic.
"If the company purports to be based in the UK, check with Companies House www.companieshouse.gov.uk to make sure that it is correctly registered.
"Do not provide any financial details until you have taken these steps and decided to accept the offer - in particular your credit or debit card details as these transactions can be difficult to cancel with your bank.
"Check with your own IT support or someone you know if you are worried."
Chairman of the Office of Fair Trading Bill Henderson MHK said: "Consumers should be very careful to ensure that they know who they are dealing with.
"It is likely that these people are trying to get you to hand over personal or financial information as well as money.
"If this information gets into the wrong hands it can be disastrous for you.
"Bank accounts can be emptied and your personal details used to set up fraudulent identities.
"Clearly not all contacts you receive will be of this type but legitimate businesses welcome consumers who take care of their information so do not feel embarrased to check them out before you do any business with them.
"If you are concerned or unsure put the phone down.
"Then check. Don't give any details out."
Consumers might wish for their names to be removed from telemarketing lists.
To do so, contact the Telephone Preference Service on 020 7291 3320 or visit its website www.tpsonline.org.uk