Northwest Guitars review for Point of Sale

Got this app for free as part of Shopify plus. When we downgraded to shopify standard Shopify decided it would be ok to start billing us for it. We've never agreed to any kind of paid plan for this app, but Shopify have been billing us for over 12 months before we'd noticed. They don't want to refund us for an app we never agreed to pay for so I guess we're taking them to court.