I was told to call them before I was arrested for tax evasion and tax fraud. I could not understand where he said he was calling from because of his accent.
There is a fairly common IRS or "tax scam" being practiced by scammers in both Canada and the USA.
USA tax payers should read this:
http://www.irs.gov/uac/Tax-Scams-Consumer-Alerts
Note particularly the links at that site, warning of the scam!