Claiming to be from the IRS.  Has called three times

5-6 calls in last couple of day. i don't answer.they do leave a message..IRS baloney.I can't block on landline as I have reached my limit on spam blocks long ago! occasionally i do call the #, keep them on the line as long as possible til they figure out that I am spoofing them.That is usually followed by a long string of swear words...i love when that happens!

What kind of call blocker are you using?
Some that are available can block up to 1500 numbers.
Some can block entire area codes, then whitelist the numbers you want to get through.