Can't register Tune Up

I have been using AVG on my home computer and like it so I bought a new AVG Tune Up on Ebay.
When prompted to enter the key code I receive a message that reads "this number is already registered in our system".
Need suggestions on getting up and running.

thanks,
Dale

Hello Dale,
We are sorry to hear that. While verifying your account you have only AVG Antivirus as your active subscription. We have sent you an email, please reply back to us on the same email with the details so that we could locate the license and assist you better.
Thank you.