JASON Mann, BT's regional spokesman advises people to sign up to the Telephone Preference Service.

You can prevent direct marketing calls by calling the freephone number on 0845 07 007 07.

However, this is not a foolproof system as not all marketing firms are signed-up. There are also a number of exceptions which allow companies who have contacted you in the past to continue doing so.

You can also contact Ofcom - the regulator for the UK communications industry on 0845 456 3333 or 020 7981 3040.

For more details click on www.ofcom. org.uk.

Under the Communications Act 2003 Ofcom has new powers to deal with individuals and companies which persistently misuse an electronic communications network or service.

Since the act was introduced MKD Holdings, a kitchen direct business and Intelligent Marketing Solutions Call Centre have had action taken against them.

Both agreed in writing to adhere to follow the Direct Marketing Association's guidelines that not more than five per cent of calls should be silent but escaped the maximum £5,000 penalty.

However, for victims of silent calls Ofcom is powerless to act if the calls cannot be traced.