Capitec poor systems have affected my credit record

I have had a personal loan with capitec for a few months now. i pay by debit order, there is always sufficient money in that account. for the last two months the debit order has not gone off from their side. they phone me and i tell them to fix their system! then they deduct the payment. now i see that my credit rating has been adversely affected due to their bad systems and no one at capitec seems competent enough to help sort this out!