Dear David，First and foremost, thank you for giving us the opportunity to address your concerns. We sincerely apologize for the inconvenience caused during your experience with our equipment. The machine has been inspected and confirmed to be in good condition before shipment. We apologize for any inconvenience caused and have reviewed your feedback. Due to improper operation, the machine cannot function properly. Our sales staff actively explained to you how to use it correctly. If you have any difficulties or questions, you can contact us and we will do our best to help you solve them