Please bear in mind that all the products we sell are specifically designed and intended to be administered by trained, certidied medical personnel. In the event these products are used incorrectly or by untrained and or uncertified individuals, it may lead to adverse or undesired performance or results. We want to emphasize enough that we cannot be held responsible for any issues arising from improper usage. To request a refund, we require a complete video recording that shows the unpacking process and the procedure performed using the product. This video is crucial in supporting your claim and helping us identify the cause of the problem. Without a video recording, we cannot process a refund.