Fraudulent charge to my credit card, after I canceled the automatic renewal

My Avast re-newal was canceled in early February, confirmed by an E-mail from Avast, dated 5 February 2016.  Charge amount is $34.99.This is a fraudulent charge, I have begun an investigation by Discover Card to atempt to resolve this situation and make sure Avast removes record of my credit card from their system.