Telkom staff laughing about customer who simply wants his credit to be paid

Telkom owes me since 5 years more than 100 Rand. Not much, I know, but it's my money and today was the day again to follow up on this at their branch in Somerset West. One of their staff members told me last month that I should bring in a statement which shows my credit so that she can make a call again and call Telkom for me. What a big mistake! This friendly lady was not in but instead another lady who told me that my credit was "processed". How can a credit be processed for 5 years? They simply didn't pay me and I even have a statement from Telkom stating my credit. The lady could not or rather did not want to help me as she said that I should phone customer care. Congratulations! That I knew myself but this call would take again a lot of time of my day with no outcome as the Telkom call center is absolutely useless and unprofessional but mostly they are very difficult to understand. Anyway, the lady at Telkom called me "rude" for the simple reason that I explained to her that it can not be my duty to prove that Telkom did not pay me my money back yet. Who do these Telkom people think they are? It was as if I spoke against a wall and at the end of the conversation this lady even laughed about me as Telkom "only" owes me 105 Rand. I heard also from other people complaints about the unprofessional staff at Telkom Somerset West but it seems that Telkom doesn't care about that. How can someone laugh about a customer who wants his money back? I would fire those people but they feel very safe with Telkom.