ABSA at it again

ABSA at it again. Zero stars for ABSA!! We sold our home and the bond was on Private One. Bond was paid and we were in credit. The balance just under R7k A day later *HUGE SUPRISE!* Small amount added as interest then almost half of the total amount was deducted as "interest" to the bank. We owed nothing yet interest charged? Private One account was closed and the remainder of the money was deposited into our cheque account. I called private banking. THIS IS WHAT I GOT. 1. Bank policy. While the account is still open there will be interest paid. 2. We owe nothing to the bank...they owe us ..yet they take interest. 3. I have no means or authority to close that account yet I am at the mercy of ABSA to close it...and we pay INTEREST ... FOR WHAT? 4. while the account is open it will accrue interest. 5. It's *****ing, there is no other explanation!