Chances are, you might have an issue with the mobile. You can check if the headset is working well using a different mobile. If the issue still persist with an alternate device proceed with replacement as per policy

4.1 How to unpair from the mobile

1. Tap and hold the Bluetooth icon on your mobile

2. Tap on the Noise air buds pro 3

3. Click on Remove / Forget Noise air buds pro 3

4.2 Pairing with a new device

Open Charging case.

Earbuds goes to pairing mode 

Remove the earbuds from the case

Tap and hold the Bluetooth icon on your mobile

Turn ON the Bluetooth

Make sure your mobile and the Bluetooth Earphones are within 1-meter range

Go to add devices in your Bluetooth settings

Search and Select Noise air buds pro 3

Tap the Pair option on the pop-up