Sale items not complete

I love the app with all my heart. It has been so good to me. But I have an issue with buying of combos and when one of them is out of stock they just give you that single item available and we usually but combos because they are on special. You end up paying more instead of saving. Their app is very smart I think when there is 1 item outstanding they should ask if they need to continue getting the special item that is not complete. I am.realy not happy with that especially on item.more than one that are on special. Other than this I'm.a.super happy customer I even recruited family members to but from the app.