Ultimate Delivery Date Range

The app started working great! After a long search, I found this one. This one started working as per my use case. Finally, I could now show proper estimated delivery as per supplier on the product page along with the custom return note. But the app all of a sudden stopped working, that too when we are investing heavily in marketing. It's been 22 mins I created a ticket, but no response. I am very unhappy the way was the app crashed. Also, there is no way to import data from the app. I am scared to loose hours days of work. I made a great mistake!! This is app is not for high volume stores. I have thousands of products.