[ Feel free to use this as a template ;-) ]

Dear Sir/Madam:

When I purchased blinds in your store last year, I asked to see your privacy policy, since the store employee was asking me for contact information.

I was told that they did not have a privacy policy, but that the information would not be used for anything but the purchase itself.

Since my purchase I have received several mailings from you. I have requested to be removed from the mailing list two times already, but I am still receiving your mailings.

Please remove me from your mailing list and ensure that I do not receive any future mailings. Please also provide me with a copy of your privacy policy, so I can decide if I will continue to make future purchases from your company.

Sincerely,
Frank Michlick

PS: While I did not mention this in my letter, I also tried calling them, but of course the store told me to call the head office. I was told to get the number off the website. Of course it was impossible to get a hold of a human in their voice mail labyrinth.