Suspended my account for no reason!

I have an account with Makro. I settled my total outstanding balance last month. Then I get a call last week from Makro saying that I short paid them by +-R70 (Cant remember, was a ridiculous amount). I need to pay it or they will hand me over and suspend my account. I asked them how can I be in arrears if I just paid the full balance outstanding and not just an instalment?<br> I was told thats how their system works. <br> I have now paid this today so I can get my account reinstated. But this puts a bad reflection on my credit record.<br> I'd like Makro to explain to me how they could do this to a customer who pays their account on time and in full!<br> <br> Im not a happy customer :-(<br> <br> Vanessa Lamb