Overbilling

I called telkom to cancel a device on July and the consultant gave me an amount to pay and I paid. August I noticed the statement only shows the amount but cancellation was not processed and I made a follow up that confirmed a few days later to have sorted out the issue. Now I received a statement that requires me to pay more than what is expected and the new consultant is telling me that I was not supposed to pay on July but wait for August. This is all new information that none of the consultants bothered to tell me and they expect me to pay. I want them to fix this mistake otherwise I’ll report it to consumer protection department. I have all the proof from the first consultation up to the latest.