Incorrect billing from RSAWeb

In Nov this company incorrectly debited my account for a service I did not request nor did they communicate with me about it. Queries simply result in "Ticket Numbers". On personally using my time & travel cost to go see them, an explanation is given. I pay the difference "owed" and they agree to reverse the cancellation fee (to make up for their error) & my fibre is re-established. Now another mysterious R784,68 appears on my statement with no explanation. My account is up to date but they threaten disconnection again. I'm kept on hold many times but today for 22 minutes (my mobile cost) calling their accounts section. I get a ticket number! Shocking service and I suppose they will not credit me for my costs incurred to fix their mess up. Ask for the CEO and you get stone-walled.