When you offer bogo for your grand opening, you should absolutely prepare ahead of time to make sure you have the inventory to supply that demand. Or just not be cheap about offering bogo and closing early to save money. This place closed early because they said didnt have enough food to accommodate. If you close early, you need to mention that somewhere outside of the door instead of turning your customers away when they go inside and wait 5 minutes before being informed or even acknowledged. When a customer comes into the restaurant, they shouldn't have to fight for attention, only to be turned AWAY.
Without the bogo, there would barely be any customers for the grand opening. Considering going somewhere else where the customer service is actually good. If you read the other reviews, you'll see similar experiences.