I have had dealings with WW&R, also. Don't give them any bank account info, SS#, etc.
It is good they haven't gotten mean, yet. They will start the hard core stuff when they see you won't pay. They were trying to collect on an old debt of mine that had been paid off for Sears. At first they were kinda polite, then it all started.
They never validated the debt, and tried to make me pay something until they got it "figured" out.
Keep copies of everything that you send and they send. Also, take notes of days and time that they call you and what was said. They broke several fdcpa reg., with me--calling before validating, threats, etc., so be careful.
Good luck, let us know what happens..karen