Faulty router, can't get my money back

At the end of May 2024 I got myself a 35mbps ZTE router online. I paid the pro-rata rate and it got delivered. To make a very long and painful story short - this router hasn't worked one single day from the moment I got it. I put the sim card in, plugged the power cable in and I wasn't able to connect to the internet at all. Not via wifi using my phone and not via an ethernet cable from my PC. I have made MULTIPLE phone calls to MTN's "customer service" and "coverage" departments trying to get it resolved. I have sent MULTIPLE emails detailing the issue (including screenshots). If a customer care representative answers my email (which is not guaranteed to happen) I get a silly response like "switch the router off and back on". And if I then reply and outline everything that I have tried and that in my opinion, the router is faulty, I get no further responses. I just want my money back as I have literally not been able to use this device. PLEASE, STAY AWAY FROM MTN. I'D GIVE THEM -10 STARS IF I COULD