Thank you for sharing such a detailed and honest experience. The performance of the scooter sounds impressive, but the after-sales and warranty issues you described are a serious concern for buyers, especially when purchasing directly from overseas manufacturers. This kind of feedback is valuable for anyone considering a similar purchase.
For everyday device upkeep during commuting or riding, I’ve found this simple resource helpful for basic phone speaker maintenance:
https://fixmyspeakercleaner.com/
Hopefully your chargeback is successful, and your experience helps others make more informed decisions.