Sarah, you don't mention if you're the alleged debtor, which makes a great difference in what a collector will say in a live or canned call. Self-identification and a mini-Miranda simply won't be heard in most cases until the agency is sure it's talking to the correct person. Ever since Foti V. NCO, agencies get sued about the same whether they favor the federal mandate of privacy or disclosure, making this a muddy issue with no sure outcome in court.
Now, if you can show a rep's statements have risen to qualify as violations, then you have a reliable cause of action. Of course, if you block calls and ignore the evidence you'll have nothing.