I know this will be contrary advice that most people give, but IMO don’t bother. It’s only $2, and not worth your time and hassle and potentially a bad-mark on your Paypal account. Save the disputes for items that are worth something.
We all know GB can have bad customer service. It’s no different than most Chinese retailers, and most retailers from any place in the world. Buying cheap crap and paying almost nothing for it means you’re not going to get good service.
Over the long-run, even with some small losses, it’s still cheaper to buy stuff from China. Just accept that, and eat the $2 loss. Leave a crappy review if it bothers you, though they’ll probably just delete it.