No products

I'm absolutely appalled by the level of service and quality of checkers lately. Besides the continued rotten meat and low quality of fresh produce, the fact that all products and their alternatives were not available is now having an impact on the specials. For example, buy 3 for the price of 2 which is very nice, however, now 2 of the 3 is not available which ultimately make the product more expensive. I wouldn't have purchased the product alone, but on special yes, but now you are left with no stock and no alternatives? Help me understand how on earth it makes sense?

Implement a rule or something that should one of the items ons special (and their alternatives) not be available, that you cannot purchase the special at all.