Interest incorrectly charged

I am writing this review here because I wanted to email you as its easier when there are lots of details that I need to share, but as a digital-only bank you still have no email support. So, now you get a public complaint instead! My credit card account is set up to pay in full by debit order, yet on my last statement I have been charged interest on both 19 May and an interest adjustment backdated to 19 April. Both these entries total R402.88 which I want reversed immediately. I did call your telephonic support line a week ago, and I was told that you were aware of this issue and that it would be reversed. How long will this take?