RANDOM CUTTING OF ADSL LINE AND WRONG BILL

We got our new landline with ADSL (the 10mbps line with 50GB data and DSTV explora bundle) beginning of Feb. Last week our ADSL line got suspended without we receiving any notification or account for no reason. After threatening everyone and complaining hte line is back. We got our account that is overcharged with just over R1 400 because they have not yet reversed the installation charge that is included in the R899 per month subscription bundle. On top of that our ADSL line got cutt AGAIN this morning for no reason and we cannot get through to the call centre or anyone for assistance. When we get through, no one knows what to do or what is wrong! This is the most pathetic service ever and we are thinking of going elsewhere for proper ADSL service, since the landline is still working fine.