Tekfusion Technologies — right side earphone is not working

Hi,

The left side, speaker side of the earphone is not working and the earphones are still under warranty. So i would like a replacement for the earphone or a refund at the earliest.
I have tried reaching the customer care number multiple time but it says the number is not available. And none of the website links are opening.
Please resolve this issue at the earliest and replace the earphones with new ones as soon as possible. If that is not possible i would like a refund for the product
Please respond as soon as possible