Keep this list in mind -- if a debt collector ever does any of this to you or anyone you know, contact a consumer attorney immediately. Keep all phone messages, voice mails, and every bit of correspondence you get from the debt collectors, and make a record of when they call, their names, and numbers.
If you are in Oregon and you know of anyone who has experienced any of these violations, I would be glad to assist. Courts can and have hit debt collectors with "statutory damages" of up to $1,000 for each individual violation committed against a consumer, PLUS making the debt collector pay the attorney fees for the consumer bringing the action.
To the left is a pretty extensive laundry list of lawbreaking committed by a Georgia debt collector against consumers in that state. These guys broke the federal Fair Debt Collection Practices Act (FDCPA) in just about as many ways as they could.