Just finished watching Reporting Scotland (the news) and you wont believe this but a guy who received a spam letter with an advert in it that he didnt want took the company to court and won lol
He said you wouldnt obviously be able to take overseas spam companies to court but its quite easy to take people from tehe UK to court.
Pretty much a good idea if a certain company keeps hitting you, just tell them your going to take them to court and they will stop !!
might work ;-)