ABSA Collections chasing their tails and wasting their clients' time.

ABSA Collections keeps calling me telling me that my vehicle account is about R1000 in arrears. I keep telling them that I have a statement that indicates that my account is in fact over R40,000.00 in advance. When I call the call center about this, they confirm that I am in advance, and they say they cannot see how the collections department can say that I am in arrears. The lady's exact words were "I don't know what system they are using". How is this possible? One bank with two departments looking at the same account, but do not see the same figures. How can one account be in arrears and advance at the same time? In the meantime, their collections department keep bugging me for no reason at all.........pathetic!!!