ABSA REFUSING TO UPDATE MY BANKING DETAILS

I informed ABSA of my banking details change a year ago and requested that they deduct my credit card instalment from that account. I phoned the call centre several times and I was advised to go to the branch. A month ago I visited Sanlam Centre branch and advised them that the call centre instructed to submit the bank statement as a proof my details have changed and the customer service agent told me to contact the call centre and was very agitated by what she told as I was advised that I should visit the branch. weeks ago, I received an sms advising me to come fetch my card at N1 City branch. I never wanted any card but wanted to simply change my banking details. I AM ANNOYED BY THIS SERVICE. WHY IS IT SO HARD TO CHANGE SIMPLY BANKING DETAILS AFTER HAVING SUBMITTED ALL THE DOCUMENTS