Infinite Product Options

Though initially helpful, the staff have become pretty unresponsive for real issues (outside of installation). We have had a bunch of issues with customer orders being able to checkout without having paying for their add-on items. And what can we do as a business? We can't really blame the customer for this, since it is our website. We are just out that money, which is frustrating. We are shopping around for another app, and until they figure out these issues, I wouldn't sign up for this app again.