Paid installment to my Foschini Account

I am in the process of settling my account with Foschini because of bad service and over priced clothes. I am left with R3000 and received notification that i am required to pay R1530 for the month of March (which i viewed it as incorrect calculation but i paid it anyway because i no longer want to be associated with Foschini ) i paid R1530 on the 26 of February 2016 which i paid on my phone using the TFG App (I always use this payment method ). On the 2nd of March i recieved an SMS (which i was charged for) saying my account is in arrears.When i call these i get given an invalid Fax number that i must email my proof of payment to. I call again i get given the same number i ask for an alternative they don't have it. I ask to be transferred to the department that i am faxing to,I get told that that department doesn't take calls. WHY am i being labelled as a man who can't take care of his bills when i have made early payment to an account that is always up-to-date.Why am i being punished for Foschini's miscalculations and incompetence.