Headphones (bought 2021) Right side not working (Kirkley NR33)

Gaming headphones bought early 2021 - right hand side has stopped working and no idea if that can be fixed or not. They weren't expensive (probably under £20) and as you can see from the photo the padding covering has started to peel off a little. If no takers I will take them to the household waste site next time I do a run, but if anyone wants them they are free to whoever asks first and can collect.