Payment arrangement increased charges

I logged a call for payment arrangement with Telkom and i was given a go ahead but the account which the money must be deposited to was not provided, then when i noticed that the deduction was not made on the last day of the month i called Telkom then i got the details then i paid but the statement came back with a payment rejection fee which i asked the consultant if it will not charge me the day she gave me the account details which is their mistakes and she told me i will not be charged a cent,

why would i make a payment arrangement for 649 if the last statement will charge me the amount which is almost similar to it (500)?

Telkom is making my life measurable in all kinds of ways, it takes my pocket money and my time is wasted each and every month in phone calls with the people with no help.

can you please close my contract and stop abusing my rights?