Sorry for your experience, StartingEarly, but I would decide how much time you want to spend to prove your point. If you don't get satisfaction within that time frame, move on and never look back.
I had this happen when a seller misrepresented her merchandise. I called to confirm the order was for the brand I specifically needed (and was pictured on her website), though it was more than the standard brand, she confirmed it, then shipped the standard brand at the higher price. Bitch.
I returned the order, but complaints to ebay for refund of postage either way fell on deaf ears. We have renovated three houses since that experience. Too bad for you and your vendors, ebay, 'cause you haven't seen a cent of our money since. Fool me once and all of that.