Welcome to Justanswer.com, my name is ***** ***** I will do my best to assist you.
AOL wouldnt call you to upgrade, thats a variation on the old " This is microsoft calling scam".
I can help you uninstall and remove AOL desktop, but before we do that can you tell me if over the phone you gave them access to your computer, or any of your credit card or banking details? ( do not tell me any of those details, I just need to know if they asked for them and if you gave them any of those details when they called )
Thank you ,