Disgusted by service and credibility

I entered into a contract with Telkom in March 2017, where I signed a contractual agreement for a LTE router data package for R349 per month including the device and data. Since the first month Telkom has been deducting via debit order a R399 per month from my account. I have queried this many times and logged many cases. I would call, go into malls and even emailed the allocated officials to solve this matter. All the staff that I deal with is clueless and responds that they will escalate my query as they cannot give me feedback. I am frustrated at the fact that to date Telkom is still deducting R399 from my account. They are in total breach of contract and I do not want to be their client any more. I demand for a refund on the overcharges as well as cancellation of this contract. I am disgusted in the response and poor service of this network

Regards, Monray