My earphones is not working

try the headset in another device with the same connector

try another headset with the same connector in your ios device

then you can verify if your headset is defect or if there are issues with your ios devices connector

if your headset are within warranty and they judge the malfunction is because of a production defect discovered after purchase

rather than a user caused defect you can claim warranty and get a new pair

Legal - Hardware Warranties - Apple

if the headset came with an ios device then everything in the box share warranty