Why is it making me sign in and pay for a free app when all my info is correct

Even for free apps you need to have a valid account with a valid payment method. If you changed your address does the new address match the billing address for your payment method? If it does not then a credit verification will fail.

I'm having same problem. I just called apple and the guy basically gave me no help. Told me to sign out and back in and I did. Still nothing. Told me that it might be a payment that didn't go through yet, but I haven't bought anything in a while and I keep track of what comes out of my bank acct all the time. So he said to check with my bank there may be some issue I don't know about but if I over draw even a dollar my bank calls and let's me know or if something didn't go through. Plus I have online banking so I know what is coming out. No help. All I wanna do is update some apps and the phone itself. But I can't. I've researched and it appears I'm not the only one with this problem, a lot of people have been having this and they can't seem to get an answer from apple on how to resolve it. Quite frustrating if you ask me.

What error are you getting specifically? Apple will block your account if there is suspicious activity on it, or if your credit card issuer has denied a "hold" request. If you attempt to update an app or download a free app Apple will periodically revalidate with your issuer. So what has probably happened is the revalidation failed.