Ripping people off with high interest rates and ridiculous fees

I have a revolving loan with woolworths that I paid off on the 27th Oct and did not close. From the 29th the account was in a credit balance paid off. Received a statement the acc has a balance of R1659 & the same amount is due 5 Dec. Called the call center to understand what this for because according to statement received I paid them more than the balances that were owing on the account. Stayed on the line for an hour whilst being taken from pillar to post. I have not received any assistance and refuse to pay this amount until they tell me how they got to it. Looking at the balance for each loan vs the payments there is an amount of over R2000 due to me. Below is the balances per statement vs the payments that went into each acc so where is the R2000 ? Woolworths financial services is ripping me off Balances: • R41126.25 • R80581.29 • R1015.34 • R25569.75 • R1006.04 Payments allocated to the loan accounts: • R44346.38 • R80581.29 • R1015.34 • R25569.75 • R1006.04 • R1500