Telkom not bother to assist with the dispute, due to their incompetence

I have taken a contract with Telkom in August 2018 for cellphone and the router, I have been experiencing poor service for that day. I have indicated the contract should deduct on the 15th of each month, in October I realised that Telkom was only billing for the router and not the phone and I went to the shop and told them about their *********** which I was advised to pay the amount since inception of the contract of which I did. They said my accounts were not joined to bill in one account of which from 15 October the accounts were joined and the outstanding amount for the I paid as advised and the router was up to date. 15 November was billed for the phone and router and a joined account till to date. In Jan 2019 I was debited with R300 something I disputed the amount which it has been happening since then now the amount is R595 and I went to the shop inquired, called the call and I could not be assisted because the amount did not appear on my account. I have been to the shop to enquire I am told call centre can only assist and call centre says I have to wait for 72 works for case to be investigated. I have received poor service from Telkom they tempering with my account they debit me as they wish and aske for clarity on why I am debited I could not get a call. Is there any help I can receive? I have more than 15 cases logged under my account but never and investigated as from day of incentive of the contract. I regret taking this contract as Telkom does not care about customers needs all they need is your money. Please help..................