Q: Apple ID

Stop using the old Apple ID. You cannot remove it. Create a new Apple ID. You can do this in iTunes. Click on the Sign In link, then click on the link to Create a new Apple ID.

My understanding is that if you create a new Apple ID, then you will have to "rebuy" any purchases made with your old Apple ID.  Purchases are permanently tied to the Apple ID you used to make them.  I would exhaust all the possibilities to CHANGE you Apple ID first:

Change your Apple ID - Apple Support

If you have problems contact Apple Support at the link on the bottom of the page.