This is a common problem on Taobao, actually. You either get your stuff immediately (like overnight), or they posted an item they didn't actually have in their possession, and you never get it. And then they refund your money to Alipay...which won't release funds to your bank, so you have to use it on something else on Taobao or some other website that accepts them.
Really obnoxious, actually. My advice is find out if they have it BEFORE you try to buy it. Otherwise it's just annoying.
And yes, I've been annoyed with Taobao lately.