Ok...they called and didnt leave a message. So i decided to call back. A non-native english speaking person told me that i had reached the " investigation dept" and that they needed all my info.

I just gave them my banking info, to pay the $12,000....  They sounded very mean and legit.  I don't want the IRS showing up on my door step. Scary stuff.

Hope you're joking about the money. If not, none of the money went to the IRS because the IRS didn't call you.

Got called 4 times today from 719-940-5251 about this being a final message from IRS as they are filing a lawsuit against me and wanted me to immediately call this number.  I blocked this number as it is a scam.

Yes, just poking some fun.  These idiots will call you until you just have to stop and have some fun with them.  I called the jerk wad back 5 different times, from five different phones.  Finally he caught on, that he was being played.