Bluetooth noise cancelling headphones (faulty) (Maiden Erlegh Nature Reserve RG6)

Black wireless Bluetooth active noise cancelling over ear headphones. These work functionally and are only a few months old, but there is distortion on the right earphone at low frequencies which I just can't tolerate so am getting rid (the manufacturer would not offer a replacement due to where they were bought from). Comes with a carry case, instructions, charging cable and audio cable for wired use.