Charged Twice for Renewal in April

I'm on automatic renewal. On April 22 I was charged for the renewal (thats fine) AND also charged on my card in a separate charge for the renewal plus something called Anti-Virus Asuurance a charge of $83 or $84; I did not ask for the Assurance, it is OPTIONAL; I did not ask for it!  My credit card company contacted you and you tell them I did ask for it, well I did not ask for it; it is an optional thing I DID NOT ask for.  And I want it cancelled because I refuse to pay for it.