Shocking service

I'm honestly getting sick and tired of explaining the same thing over and over again. I went to you hi-fi Corp store in Woodmead to requesting a settlement amount, which I paid in full. WHY DO I STILL HAVE AN OUTSTANDING AMOUNT?! I've explained this over a 1000 times to your call center/collections staff where Thando said a manager would contact me to resolve. I am still being bugged by your rude agents. Can someone competent contact me to resolve