Q: Iphone 5 stuck on activation lock after IOS 9.3 upgrade

If you can't activate your iPhone, iPad, or iPod touch after installing iOS 9.3 - Apple Support

I entered the required data several times, and I am sure I did not give bad data, yet apple disabled my AppleID due to security reasons. So I reset my password but my iPhone5 does not recognize my ID, my Iphone 5 is not listed in "find my iphone" so I can not remove the activation lock. I am stuck despite reinstalling, despite restoring via recovery mode, despite dowgrading to 9.2.1 via DFU mode.

Really ridiculous having bought a product for hundreds of euros and now it got bricked by its own producer. Is it on a purpose then? If so, won't buy anything else from Apple.

Any help?

thx