Maybe then, you might explain WHY those letters often insist we call them, and then are put on hold for at least an hour (each call). After that the call transfers, we are asked for SS#, then promptly DISCONNECTED!
This has happened not once, but 8 times this year alone-understaffing isn't a good retort, the customers get the bad end of this, and it needs to change. There must be a reliable method to reach the IRS