Payed up letter

After I settled my credit card via Absa Bank online banking I called them to cancel my previous payment arrangement and get a paid up letter. They told me to call the next day because the money is not yet cleared. The following day I called but this time I failed the security questions which I passed first time when I call. They ask me to visit the branch for further assistance. I payed up my account via app and I used my airtime to call them yu knw why, I am afraid to visit the branch because of covid and as a person living with chronic disease I am avoiding using public transport.

I think it's unfair to be sent from pillar to post after paying your account in full. The time I called the to make payment arrangements there were no security questions but now when I payed my account in full I am treated like want to *****.