I've had similar problems signing in to my Cox acct. in past years. My password is never recognized when I try to sign in a month or two after re-setting it once again. And then I get a security question which has changed since I last re-set it. I'll get a different security question from years ago, then answer that one with the answer that I originally provided years ago -- and it does not recognize the answer and I'm blocked once again. So, what happened to the security question I most recently established? And why don't I get a chance to answer that one instead of the old one?
I understand Cox is probably trying to defend against hackers, but this is ridiculous. I always have to start the process over again and re-establish I'm the account owner, re-do password and / or other related info -- but no new info seems to be saved by Cox to identify me when I try to get back in. Why the hassle?