MTN poor service delivery

I have taken out a router at mtn in August of 2024. I cancelled a router that I had with them in the same time. They took the old router from me at the fleurdal mtn in bloemfontein, they sent it away via courier. 17 days later my new wi fi was turned off turns out the old one was never cancelled. They told me that they would fix the issue. I have no debit order on the new wi fi because they logged it on the old wi fi debit order and that debit order has been cancelled so every month I have to drive into town to pay it. I pay it on time they allocate it to the old billing profile and what do you know my wi fi is off again. Goes like this every month. I pay they dont do their jobs and it gets turned off again. I then decided in december to go pay at a different branch at the loch logan waterfront bloemfontein on the 2nd of december 2024. two days later wi fi off again. Spend hundreds in airtime fixing the issue once again. but this time they really lost the plot. it is now January the 2nd i made my payment again but what do you know wi fi off again. spent R300 in airtime trying to resolve the issue. best they can give me is that the payment was never allocated for december so now i wont have wi fi for a month because they did not do their job again. Who will be held responsible for the loss of income as I work from home. I teach online. Every class I miss I get fined 20 us dollars on top of the income I would have made for the class. Plus the hundreds upon hundreds of rands in airtime trying to resolve the issue you ask them to phone you back they dont. Now you phone and they just dont pick up anymore.