Yeah, they basically don't have model you ordered on hand so they send you something closely matching. Especially Chinese, they are selling on eBay, Lazada, Shopee and offering huge amount of products, it's usually a huge mess, not keeping updated etc. Their game is "can it be used for intended purpose?" It's a chair, it can be sit on, so you have nothing to complain about. You will probably get refund, but getting exchanged for ordered model will be hard, since they don't have it in stock.