Worst ISP I have dealt with

It's been 3 days since they had come and changed my fibre box against the wall. Still, I have no internet. I was promised to follow up with calls after 6 pm on the days I had queried. This happened on 2 occasions but they did not call I had to follow up with them costing me R300 in airtime due to the lengthy hold times. Then still after 3 days lots of frustration and money in airtime still no resolve. They have been escalating this for the last 3 days still no resolve.