Listed on credit bureau for an arrangement that they failed to action..SIS

I was not informed about a R250 road assistance shortfall. I called to enquire about this additional amount and i was told that its a shortfall for a roadside assistance that i requested and the money will be debited from my account in May. They did not debit the amount instead they submitted a report to credit bureaus that i defaulted on my payments. i called again to enquire and i was informed that i had to make an arrangement for the shortfall to be debited. Why was i not informed the first time i called? I then requested for the amount to be debited in June and i received a confirmation SMS to that effect but to my suprise the money was not debited as per the arrangement. I have received an SMS that i owe R616 how come? i called again and was informed that it is a mistake. A costly mistake as my credit score is now affected negatively. why do we have to make arrangements' if the company will not action the arrangement? now i have to call for 6th time for one thing? this is tiring and your stuff members are rude and lacks knowledge and customer service. Pathetic!!!!!!