Bad service

I have a contract for home wifi with mtn , lately I have been experiencing connection problems for the past 3 months. I called mtn customer care many times on the last call I was told that the tower I'm connecting from has been down

But still I can't connect , so I called to cancel my contract because I am paying for nothing since I don't get the service I'm paying for but was told to pay a cancelation fee of which I dint have I'm so frustrates because I have been paying for nothing all this time