SETTLED CCOUNT

I've had an account with rcs for over 2 years and have been paying loyally even though I felt their interests are very high. In June I decided to settle my account. I called them and aske the lady I spoke to specifically what was my settlement amount which she than said it s1454.20,which I paid on the 11 June 2015. yet on the 27th of July they debited R59 from my account. as far as I'm concerned the account has been settled and I owe them nothing. I called them again only to find out I just paid the outstanding amount and not the settlement amount. I was not inform their is a difference when I 1st called. THE LADY I SPOKE TO WAS NOT MUCH HELP,ALL SHE SAID THERS NOTHING SHE COULD DO I MUST JUST PAY THE OUTSTANDING AMOUNT. SHE DID NOT EXPLAIN WHY OR HOW. COULD NOT OFFER ANY ASSISTANCE.