Nuisance sales calls are not a matter for the police.
If you are recieving these the first thing to consider is for your telephone number to be ex-directory. This will stop a great deal, if not all, of the telemarketing calls.
Another way of stopping the calls is to register with the Telephone Preference Service (TPS) – this is a central register that holds details of all the people who no longer wish to be bothered with telemarketing calls. Once registered with this service the companies are not allowed to call you. There is also a corporate telephone preference service.
The telephone number for TPS is 0845 0700707 or register on line using the link below