Exorbitant amount debited on Avon account

I am an Avon rep for a year now. I placed an order for March 2019, wherein my account showed that I did not have an outstanding balance (Avon does not release an order unless the account does not have an outstanding balance). Received my order with my invoice, which stated I owed an amount of +R3'300-00, however my order was to the amount of R700-00. I was advised by the area manager that I apparently did not pay from last year. Which is appalling as if this was the case then my orders which were placed monthly, would not have been released.