No you will not be banned for asking your items/Qi/Credits back.
It seems that there's something wrong with the address (maybe full inbox), but please, be patient. There are many people who have lost stuff. And Nabi, being small indie gaming studio, doesn't have resourses to instantly fix everything.
Moderators (super or otherwise) can't help you, not even all admins can use features needed to recover your stuff. And even less people have access to that Support email, wich slows down this restoration.
Qi/Credits/Items will be added to what you have now, so no worries.