How do you know they are selling your info
The CA address I got from one of these when I sent a reply to the message, who said I signed up with that address. (The only address I ever signed up with, is my true British address, I want them to send me my money, so why would I use a fictitious one?).
There is a bit of wisdom on the net that says: "Don't mess with senior citizens.........they have nothing to lose!". In the spirit of that and because I agree wholeheartedly with the premise I try to do my part every time I get someone else's email. I ANSWER IT! Merchandise receipts and membership confirmations are the most fun of any. On the purchase receipts I normally cancel the purchase and request my money back. On the memberships it's fun to cancel the membership and ask for a cancellation confirmation. The fall out from both activities and the confusion can keep me entertained for at least a week.