Bose Earpods

I bought Bose EarPods in December 2023. Six months later, one pod was not working. I contacted OneDayOnly. They said I must send them a serial number before they arrange for collection. The box, earpod, and charging point also don't have the serial number. I also downloaded the Bose app to find them according to a Google search. The device is not responding. Now I am stuck with a device that is not fully functional and OneDayOnly can only assist if I have a serial number which I am struggling to locate.