Hardware is completely wrong (Balenciaga hardware is more molded, not so square) and the tag is off -- the circle after the N is way too big, the Z is too narrow, the font should be sans serif and there should be a strong underscore between Balenciaga and Paris for a "Z" bag. And a minor point about the seller, but the claim of a $1700 retail price in the US is off (just another indication of a dishonest seller).
Try to get your money back...if you used a credit card, you should be able to. Good luck! I'm so sorry this happened to you...I bought one bag on eBay, and I was so nervous just because it can be hard to tell what's going on in the photos.
For future purchases, try memorizing the silver tag/what to look for on eBay pages at ateliernaff. It's an excellent reference!