Incompetance

I recently paid my account in the Zewenwacht mall branch in kuilsriver, i then recievd messages saying i need to make immediate payment i called the number and tild them that i paid my account and they said its not picking up as a payment, the lady then said i must take proof of payment to a store and have them fax it through,The lady assured me no interest will be added to my account until this is sorted, I went to the adderly street branch with the proof and was told the fax machine doesnt work, I emailled the proof to them and then went to American swiss, they called the customer services department who said everything on the account was OK and I should ignore the messages, The messages continued a few more times then i got a call from the collections department who said the payment was still not showing, I informed the lady about what I was told and she said i must go back to the branch where i made the payment and they need to fax it, I told her that because i am also working i wont have the time and i dont feel this i should be inconvinienced because of there incompeatance, she assured me she wil fix this and a manager would call me the next day, that was 2 months ago