You are Harrassing ME!

So Nashua Mobile closed down, and sold their debtors book to Norman Bissett & Asscociates to collect outstanding accounts. Nashua had processed a refund on my account which I was informed on, but apparently not communicated to the credit department. NBA starts harassing me, and I continue to protest my view.<br> Eventually, I cannot continue and pay the bill and receive a 10% discount for paying promptly.<br> Now - months later, 3 SMS's and Two emails yesterday and today demanding the R87.<br> I call the call centre yesterday, \don't worry