Every time I want to continue by buying more gold bars, it now always says store is unavailable at this time. It's done this since I've upgraded my iOS to 9.2. I've reinstalled them both and same result. What do I do?
It could be a temporary issue, like a connection problem with the store. I would check out the information saved in your app store profile, card details etc, maybe something needs to be updated or checked before it will allow you to purchase.