Bad customer service

I had a fibre line with web africa and needed to order a slower line as I was renting my house. I called in and asked them to keep the line active as and toreduce the speed as my tenant didnt need a fast line. A few days later my internet was disconnected and the lady at the call centre told me the line has been cancelled. I then said she should leave it that way. I received a bill for the month even though the line was canceled. I called in again and another lady told I got the incorrect info and the line hadn't been cancelled. She would reduce the line speed and correct the account and i would just have to pay the rate for the reduced line speed. I paid the amount the month. The line was never reconnected and my tenant decided to get his own internet. The accounts department called me telling me I them an outstanding balance. I have all the recorded voice conversations with the call centre personal. Please can someone get back to me to rectify. Thank you