MTN WIFI Router Nightmare

On the 28 July 2024 I app**** for an MTN router of R499 on their website. I was charged R611 as an upfront payment. I was informed R499 was for usage in August and the balance R112 was the upfront service fee. They delivered the router a week later but it took 2 weeks for the router to be activated after I had to call their call centre 5 times and visit their store, this just to get the router activated. They then confirmed my debit date will be the 4th of each month, the fourth came and they never deducted. I called them yet again to enquire why it was not deducted and they said I now owe them R1500 as they have no record of me ever making payment of the R611 and I now get informed I owe them payment for August and September and some other service fees. I called their call centre again and no assistance. went to the branch and they just said they have no idea what is going on they cant help. The MTN service has been a nightmare since I got it and I am NOT the only person experiencing this. I have family members who also took the router days after me and have experienced the exact same issues and treatment. None of the call centres or branch staff are of any assistance. and now a call centre agent told me my account is with their legal department as I have not made the payment of R1500 which I have no idea how that amount came about