Telkom & NuDebt are trying to withdraw funds...

Very briefly: Telkom & NuDebt are trying to withdraw funds from my banking account *******ly for over 6 months now for a service that never worked (an LTE A Internet line) and was cancelled and mailed to them back in May 2015. They were meant to send out technicians to check the 40MB line but never did and they line worked intermittently for about week. As a result I got myself a line from MWEB as I need to continue running my business. The contract with Telkom was hence cancelled back in May 2015 and I have sent probably 10 emails to Cindy Chalmers from Telkom and about 5 emails and 5 calls to Dineo Maheho from NuDebt and still no response or acknowledgement of cancellation while they continue to try withdraw funds from my account. They have also blacklisted me as a result of this and so further damaging my credit rating. This is unacceptable and I have now enaged with my lawyers because if this is not sorted out soon I will sue Telkom for damages (financially and personally).