Trouble with iCloud ID not switching to new Apple Id
I changed my apple id months ago, but I can not get my icloud id to change with it. I've gone into the store in my settings, signed out and back in, which did reset my apple id. However, my icloud id is still the old id and will not allow me to upgrade my icloud storage plan because when I sign in its with my old id. It won't allow me to press/click on it to change it, it's grayed out. I also went into my icloud.com on my computer and it states my apple id is my updated email address. How else can I change the icloud ID? I realize you sign into your icloud with your apple ID. But when I go into storage settings on my phone to upgrade my storage plan, it won't allow me to confirm by signing in because it's using my old icloud id?
Please help. I need to upgrade my storage asap for my new job.
iPhone 5, iOS 7.0.6