I just received the same computerized voice leaving me a voicemail regarding the IRS is filling a law suit against me. I received the same voicemail twice last Thursday as well. It's a scam. The IRS does not make such kind of calls.
Received a computerized call from this #, they claimed to be IRS. I hung up on them! I *67 the #, a foreign Indian sounding man answered with his IRS how may I help you? I told him LIAR and I hung up! Damn scammers!!! Wish they'd get caught.