I have Adobe CS6 master collection, and I’m trying to switch the computer?

So when I install my Adobe CS6 master collection it keeps saying that I have 30 days to take it out of the existing computer because I already have two registered however, those computers I know longer have access to and I've been trying to register on the website website, but they're not listed and customer support is not helping there's no one to call and the chat is just an automated message that keeps repeating the same crap. How do I de-register a computer on my Adobe program that I don't have access to, and isn't even listed on the web site????