not sure if any of this is of help (from the Telephone Preference Website)
Recorded messages - your permission is needed!
If you are receiving unsolicited sales and marketing voice recorded messages down your telephone line, and you have not given prior consent to receive such messages, you can ask the marketer to stop sending these.
They are legally obliged to act upon your request.
However if you are still receiving such calls (or it is not possible to ask the company to stop sending these types of messages) you can complain directly to the Information Commissioner's Office (ICO). They are the government body responsible for enforcing the regulations.
Please note complaints about text messages and automated voice recordings are covered by new regulations overseen by the ICO. For more information please see their website
www.ico.gov.uk or phone helpline on 01625 545745