Customers seeking assistance with NIU electric scooters, e-bikes, or warranty support in the United States can contact the customer service department via their dedicated toll-free telephone hotline at +1-877-295-8403. Additionally, users can reach out electronically by submitting inquiries to their primary support email address at [email protected] or by visiting the official online support help desk and ticketing portal hosted on their corporate website to resolve warranty claims, part replacements, or app connectivity issues.