As lyndal said the bots have picked up the word "ivory" hence the removal and 3 day suspension.  It's a waste of time emailing ebay as most of the time the answer to your email has nothing at all to do with your question  I would be on the phone right now demanding to speak to an Australian Supervisor (will still have a non-Australian accent) and stating in no uncertain terms that your listings be reinstated and your suspension squashed.