Terrible customer experience at off boarding

I asked discovery more that 7 working days ago to close my credit card account which is fully paid up. In between that time, I spoke to them again to emphasize the message which they seemingly do not get. Today on 7 April 2020 the account is still not closed and they are charging me interest. The account is on a positive balance, outside of account fees, how do you begin to charge interest???

They have a very sleek onboarding process but should you decide to close your account, they are not as loyal!

This is not the first time I get a negative customer experience with discovery.

I am reconsidering whether I should still keep the rest of my discovery portfolio.