The best way to contact Kindle customer support is through the Amazon.com website; an Amazon.com account is required. Amazon.com has a webpage called Amazon Device Support that has links for Kindle devices.
At the Amazon Device Support page, clicking on the thumbnail of the specific Kindle device opens the webpage Help & Customer Service. On the left of that page is a Contact Us button that takes customers to a page with options to contact the seller, KastarUSA, or Amazon.com through e-mail, phone or chat.
Users can access the Amazon Device Support page from a Web search engine or from Amazon.com's general customer-service page. The general support page has a drop-down menu for various Kindle products under Device Support, which is listed on the left under Recommended Topics.