ABSA Bank bullying clients by draging its feet

I payed off a credit card I use to have with ABSA bank 3 years ago. I received a call from ABSA in September 2015. The staff at the credit card division confirmed that ABSA had over charged me on interest 3 years ago. Due to an internal audit they realized their mistake. ABSA now has to pay me back a fair some of money. After supplying ABSA with my new banking details I was informed that I will have to way 21 working days before I can expect payment. This is totally unacceptable banking practices. I lodged a formal complaint with ABSA's customer complaints department on the 18th of November. To date I have yet to receive the payment owed to me or get any follow-up feed back. Interestingly enough if it was me owing the bank money, they would have had zero tolerance with me. It goes to show ABSA Bank resembles traits of a REAL BULLY!!!