Telkom Accounts Department Frustration

Very frustrated with the accounts department on Telkom's side. This is the fourth month where I have had to phone, hold and dispute our account, as the billing is incorrect. The company gets charged for double fibre lines, unknown extra charges and unexplainable reconnection fees. Each time I receive a Reference number, I have to wait a month until the 9th to see if the account was rectified. Why does the Accounts department not have the facility to amend and resend statements / invoices once resolved upon follow up? I can ensure that my problem would have been rectified ages ago. Our company dropped Vodacom as well as our IT company to run our fibre through Telkom, as they are the main providers in the country and I am regretting that decision. We are being overcharged and would have overpaid if I hadn't been vigilant.