Incorrect interest rate app****

FNB private client does what they do best, Disappoint. Arguably the best tech bank, but conversely the worst in terms of customer experience. The bank has acknowledged that they have been charging me the incorrect interest rate on my credit card after I pointed it out to them. There has been little progress in reversing the excess charges following a couple of emails to a consultant ,the interest rate review department and the customer care department . Clearly they are eager to overcharge the consumer, however the reversal of the charges is not met with the same enthusiasm when overcharging. My days with FNB are numbered, I just need to be brave and overcome the admin hurdles and take the plundge.