Frustrating and Disgusting with Telkom WiFi employees!!!

I have a Telkom Wifi service contract which i signed in February 2019, but ever since then i have been receiving the statement with the incorrect amount and the details on the statement does not correspond with what is on the contract. I have been trying to get this solved since then, i even resent the application documents over and over again to different people but no one fixed the problem. i was told that i should pay the specific amount which i did so that the next following months statement could have the correct customer details and billing details but nothing was fixed. Yesterday i received a letter of demand for the debit order rejection fees as the debit order is going off the incorrect account which is what they should have fixed. This is very frustrating since i have asked to get in contact with the managers but they refuse to get me in contact with them. I have email correspondence from the begging of the contract to proof that i have been trying to get this people to resolve the matter which they seemed not to care!!!! it cannot take a year to fix a simple problem!!!