Dyson Corded Vacuum Whistle Sound Issue

I've had to send my Dyson corded vacuum, which is still covered by warranty, to the service center on 5 separate occasions because of an ongoing issue with a whistling sound. After reaching out to customer service and engaging in a video call, they verified that the item required maintenance. Even after sending it in, the handle was replaced twice, but the problem still persisted. According to their statement, they identified a problem with the handle and proceeded to replace it. Afterwards, I sent some videos via email that clearly captured the whistling sound to support@Dyson. They responded by requesting some personal information, explaining that they needed to bring the device in for immediate servicing. However, upon sending it, the service center insisted that there was no problem with the device and returned it to me. There seems to be a lack of consistency in their processes. I have included videos that clearly show the problem I encountered with the product. I kindly request that my product be replaced after 5 unsuccessful service attempts and ineffective repairs. Continuously being passed back and forth is not a viable solution. It appears that no matter what problems we face with corded products, they will remain unresolved. I kindly ask the technical support team and higher authorities to review the videos, examine the product history, and promptly resolve the issue by providing a replacement for my product.