Can't stick to their own arrangements

I have been paying my Nedbank Personal Loan account with no hassle for years.<br> Then I lost my job and made arrangements with Nedbank that I would pay them once I started working again.<br> In January 2014 I was employed again and made arrangements with Nedbank for the arrears amount as well as that which was still outstanding.<br> The agreement was that Nedbank would take the usual debit amount as well as an extra amount of R1006.90 for the following 6 months to catch up on the arrears amount.<br> End of January they did exactly as was arranged. <br> That was the first and only time.<br> They never took the extra amount again.<br> Seeing as I have been calling Nedbank and making the arrangements the whole time, I didn't bother calling them now as I was sick of running after them all the time.<br> But I still paid the normal amount as per Debit Order.<br> Then in November, I get a call from Nedbank where they DEMAND payment on the arrears amount otherwise it will result in LEGAL ACTION???<br> I stopped the Debit Order and am still waiting for Nedbank to call me regarding this matter.<br> NO CALLS FROM THEM WHATSOEVER.<br> If they take legal action against me, hell WILL break loose.<br> I suggest someone contacts me URGENTLY!!!!!!