Received a call from "ExxonMobil Products" and didn't pick up.  Message said it was the IRS trying to contact because they were about to sue me.  The message was cut off by another call from a different number from Name Unknown which said the same thing!  This number was from a different area code.  In it they asked me to call a third number in a third area code.  The IRS does not contact taxpayers by phone or email; they use print delivered by the US Postal Service.  They also don't make obvious grammatical errors in their communications. Scam.