Pumper Bundles Quantity Breaks

The app simply doesn't work. I've spent weeks in the chat trying to solve my problem but they have no idea. I've created quantity discounts on my website. A customer will purchase multiple items that should qualify for quantity discounts and they get maybe 1 or 2. I've rebuilt everything and promised that "it's fixed" multiple times with no resolve to the issue. I really wanted this to work but the app developer has no idea how to write the correct code to get it to work. I would stay far away from this app unless you want angry customers for not getting the discount they are promised.