Cancel these suckers

How do you get rid of these suckers once they've infested your computer with their crap? I tell them I've canceled–don't even care about getting my money back from these frauds–they send my an acknowledgment letter that it's canceled then I get another auto letter that my account will be debited again in two weeks and I can't find any settings to shut down payment. HOW THE HELL DO YOU ACTUALLY GET THESE FREAK OUT OF YOUR LIFE???

Hello Michael,
Let me clarify this for you. Your AVG Internet Security is due for renewal but the payment has been cancelled on your end. The renewal option will get stopped after three attempts. That's why you received a second notification. Would you like to cancel the auto renewal status of AVG Internet Security? The auto renewal option has been cancelled already for AVG PC TuneUp.

Hello Michael,
Let me clarify this for you. Your AVG Internet Security is due for renewal but the payment has been cancelled on your end. The renewal option will get stopped after three attempts. That's why you received a second notification. Would you like to cancel the auto renewal status of AVG Internet Security? The auto renewal option has been cancelled already for AVG PC TuneUp.