Pre‑Order Helper

Terrible terrible support. The app was over selling my products where i had to refund so many people. I told them about it but they never fixed it. When i uninstalled the app i needed them to login and remove their code but instead they ruined my website and removed the ATC button from my collection page and they reply to me few days later that they will get someone to look at it. Seriously? You break someone's website and you want to wait a few days to fix it? I paid my developer to fix it. I only liked this app because i could manage my pre orders with csv file. But what is the point if its going to over sell my products