They never leave a message, you can't find a listing for their "toll free" number in a reverse lookup, and even after being informed in writing that the "debt" they are trying to collect is nonsense and that they are to cease all communication they continue to call in direct violation of the Fair Credit Act. No amount of verbal/written/faxed communication seems to make any difference to them.
I would like to know if there is a class-action against them I can join, to put them out of business? If so, sign me up!
They are the *** of the earth.