I bought a pair of Xiaomi Earbuds, but the left earbud stopped working for no apparent reason—it wasn’t dropped or exposed to water. It doesn’t connect to Bluetooth or show up in the Xiaomi Earbuds app, and the reset button on the side doesn’t work, so I can’t restart it. I contacted Xiaomi customer service, and they told me that the seller is responsible for providing support or directing me to a service center, and that I can’t go to any service center on my own without informing the seller first. Please direct me to the right place.