Very bad Telkom service

I am trying to get a new voice line from telkom so I can get A DSL with another ISP. The sales department will not process my order as they say I have an outstanding amount on my old account. When I ask how much, I get told I have credit but they can still not process my order and I must clear my invoice with the accounting department. The accounting department say I have credit and these is nothing they can do. They then just refer my back to the sales department. This has been going on from the 16th of Feb 2018. It's very difficult to get hold of a sales person in the first place and then I get told to try and sort out an internal Telkom system problem so my order can be processed. Very very bad service from Telkom.