Over charged and inexperienced staff

Telkom is really exploiting customers.I went to telkom Midlands liberty mall PMB.I went to do an upgrade for my data contract .The guy who helped decided to open a new contract for me instead of upgrading..I was very angry and the other lady advised me to cancel the contract that was due for upgrade and accept the new one and I took that advice.on the fifth of May 2018 telkom tried to debit money on my account and it remained unpaid due to the fact that debit order date was wrong .I phoned telkom customer care and they told me to pay the money manually. The amount of 363.61 was paid by me on the fifteen of May 2018 to rectify the mistake done by the guy who open new contract for me .On this month I noticed amount of 578.59 on my statement and no have noticed that they added 202 .00 which is the rejection fee . I call them to reverse the rejection fee because It wasn't my fault and I gave them 15th as debit ordrr date.now they double charge me for this month regardless of weather I paid them money for May including subcribtion fee or once off fee.The most frustrating thing is that they don't attend to my problem. They just wanted to debit my money and they money I dint even know. They should stop manipulating people .they should also hire knowledgeable staff.I'm really sick and tired with this and I want my problem to be resolve as soon as possible