Help needed on resolving account issue

Hi,<br> <br> I have made my payment as agreed of R700 now I get an SMS stating I have not made the required payment and now need to pay over R950. Please can someone contact me urgently and explain to me how is it that I owe R950 when I have been making payments and caught up where I may have short paid or not paid. Your call centres and branches are not very helpful and it is simply frustrating me they do not have the authority to fix the arrangements I make. I seriously need clarity.