The Secret Sanctum review for Amplify | Bundles & Upsell

I left a 5 stars reviews in the past, because their customer service is excellent and the app is very easy to use. When it comes to charges, though, they are not so excellent. I would be happy to pay whatever the charge if they bring me business, but as a matter of facts thay have charged me for something has nothing to do with their business. For example, I set with them a Minimum spend amount of £50 to get free shipping. I have a product (one single product, not a bundle) that costs £52, so they have charged me because they consider every amount over £50, even though that sale doesn't depend at all from their work but it's the price of my product. And also, it happened that one customer bought one single product (clearly it's not a bundle, nor an upsell nor a cross sell) and when I asked explanation they told me that the customer bought it from their cart. Well, I deactivated the app.