My calls stopped when I went there too, like Avenger said he or she did.
Sorry to see you all having a problem. John O's idea is funny. I like it, but here is a tip to freak them a bit since they freak you out a just a bit with their calls.
Keith Katz has a twin brother by the name of Kevin who also works there. He loves Starbucks. The father of these twin brothers name is Bernie Katz and he is a crabby old man. He works with them as well.
No threats, folks. There is no need for this and think that it's not cool to threaten. Just let them know that you know who they are and you want off from their list. That is all. Ask for Jake. He drives a silver Chrysler. There is a Geoff (Jeff) who speaks with an Aussie accent and a Frenchman named Gregory and also a guy named Danny or something, who is short. Hope it works.