Poor after sales

I bought a pocket router on the 07/01/2023 and the battery is now swollen. I went back to them on the 20/01/2023 requesting a refund as the router felt like it would burst. I was told that I needed to send it for repairs and it goes for a month. I've asked who would be paying for my WiFi if the router is sent away for a month and I wouldn't be using the wi-fi but I would be liable to pay the monthly subscription. The response was they don't know and I must just being it to be sent for repairs.