It is not Greenpeace just someone posing as Greenpeace. Anyone can get the text in caller id to be what ever it is.
I use phone lookup to verify numbers.
i called them back, waited 20 seconds for their rep to answer, and they said they'll remove my number from their list in 12-24 hrs. hopefully it works!
these guys are greenpeace and will probably take you off their list if you ask them. for the rest of the scammers out there get a call blocker on ebay or amazon and block them so they never bother you again. we have more than 3 times more calls blocked than allowed