Taxpayer Advocate Service for the IRS. They make sure taxpayers aren't treated unfairly by IRS agents, so they want to know how your appeal process went.
It was a call asking for one of our Attorneys. Said they could only call back. could not leave a phone # for us to call back at our convenience.(just like a sales call)
We also received a call from this tel# as well from ICF asking about the service we received from the IRS and told them how uncooperative & rude the representative was.