Unsatisfied with MTN service and would like to enquire about canceling a contract with a faulty service internet connectivity

I have an unresolved wifi connection issue. So this is my story. I took a phone contract with MTN last year, initially when I got the phone it had issues so I had to return it and have them replace it. Fine that was sorted. So later in the year last year I took out a second contract but this time it was for my home Wifi. I used stay in Pretoria and recently relocated. When I was getting the Home wifi I explained that I will be moving soon to a new place, could he please check of there's coverage in the area I'm going to and will the moving not affect my internet connectivity, the gentleman assured that all have to do is plug in my router and I am good to go, right. So for the past two weeks I have not had any internet connection, mind you I paid for both my contracts, I've visited the mtn store twice now and nothing has changed. I called them once ans they told me they will sort out my issue, it's been two weeks and it is still faulty. I emailed them with my concerns and enquiring about canceling the Home wifi contract but they never got back to mw with the actual amount I need to pay if I were to cancel my contract. What frustrates me is I am paying for a service I am not using and now I will have to pay this large amount foe canceling a service that doesn't work and literally no one has made time to help me with this.

I am in need of assistance, how can I cancel WY wifi contract without paying alot for it because my wifi connectivity and router are very faulty.