In my mother's case, I had a 'senior engineer' tell me that iTunes 'does not remember old Apple ID's.
It just does not do that!', and yet it clearly, in her case,
DOES remember, and refuses to forget.
They have, even the senior engineer, blown off the issue. They keep blaming it on 'old files from the previous Apple ID', even though I've gone through each app one at a time and verified their account, and removed all of the other content. Something is wrong with the beast sleeping under the surface of the iCloud Miracle... (And they claim not to be able to tell through any utility or otherwise, what account/Apple ID was used to purchase anything. AND all of the 'purchased' stuff she might have was 'purchased' for FREE!!!



So WHO WOULD GIVE A POOP?)
Maybe they need to do a complete rewrite of the entire system. It's showing its age. I mean, not able to permanently change iTunes content when you change your Apple ID? What sense does that make. Constantly prompting for 'verification', and then throwing up old, or not prior used addresses. Forcing a password change if you blow entering it twice. That last one is a b*t*h for her. She's freaking 75 and a cancer survivor for 30 years, and it's taken its toll, and she has to constantly verify her password in a system that still remembers her old account name, that has been dead for nearly a decade?**
At what time does that become just raw user abuse and actionable in a court of law?
** Oh, and a new wrinkle: She got prompted for a security question that she didn't even answer! How's that for abuse!