Absa's ********* behaviour

After noticing that the interest rate on my AVAF account was incorrectly adjusted in December I raised this via the call centre. My interest rate was then corrected however the credit for the difference in the incorrect rate charged had not been credited to my account. This amounts to theft and an extremely poor system of internal control in Absa. How many customers are being de*****ed both by charging an incorrect rate and then by not refunding those customers smart enough to identify these invalid charges. This goes against the principles of ethical behaviour and treating customers fairly.