Received call 2/2/17. Did not answer, but did call back from my secure work phone to see what sort of message I would receive. Of course nobody answered but they were kind enough to advise that I could leave a voicemail with my personal information and confirming that I owed over $10,000 in taxes. They also did have an Option 2 to be added to their "do not call list". Selecting that option does NOT remove you from their list, but confirms that your number is an active phone #, which they will then resell to other marketing companies.