Deleting banking details

I've submitted my tax return and I'm due a refund, without any audit done. However, SARS said I need to delete two of my three banking details as they wouldn't know where to pay the refund. On the correct banking details it has a status 'Outgoing', is this fine or should I continue to delete the old banking details?
And will this delay the refund due to me?

No, you must delete all the banking details which are no longer applicable. This will speeden up things.