Mtn router

Mtn is a big ****. I app**** for an mtn router last year November 2025 and when applying they said that the deal was for a unlimited data which is R295 per month and I was happy with the deal so I took it. They delivered the router and I used it but the data did not last for even two weeks and I called them and they gave me excuses which I did not understand. I stopped paying for the router I called them and asked them to cancel my contract with them but they failed to do so and now they call me every single day saying I owe R6500 for services that I did not use