If you thought calling the IRS customer service line was bad enough just wait for them to cut back telephone service that much more.
http://www.apnewsarchive.com/2016/The-official-IRS-watchdog-is-warning-that-the-agency-may-soon-dramatically-scale-back-telephone-and-face-to-face-service/id-1db0da71cbe040b9aa303b856ebd3e19