This number is part of a scam that an East Indian group of people are using to defraud Americans via personal credit card or wire transfer.  They call claiming you are being sued by IRS (not the IRS) and that you need to pay them now to avoid a court appearance or a warrant being executed for your arrest.  Please report these people to www.TIGTA. gov for impersonating the IRS and trying to collect tax debts that aren't owed.  These people are a menace.