Hey there,
Game Master Lorrothir at your service! Checking this out, it looks like I should be able to help!
First up, I have provided a replacement 90 boost to your account since the first one was overwritten with the 100 boost. It should be available using the normal menu shortly.
Secondly, the originally boosted Priest character is currently locked. This lock was placed on the character becaues a dispute was filed through the payment provider on the purchase. So since the order for Legion was refunded, the character that was boosted using that order was locked. It will be unlocked upon repurchase.
Last but not least, the item you mentioned. I had a chance to look into this request as well, but am sad to say that we're currently unable to unbind items from players once they are equipped for whatever reason.
I hope this info helps! If there's anything else you might need just let us know! Thanks for playing and enjoy the games!