No one understand my query

I have been trying to update my card details since March without any success. George Thulo rep**** to my query with a generic copy + paste response. I’m able to go through the process including approving the mandate on my banking app to the point where I get ‘transaction verified’ notification. The issue here is that after all that when I go back to ‘my account’ the old card number still shows and not the new one, your system does not update the card number – and this is my escalation. Sadly no one at RAIN seems to understand this or know how to go about solving my challenge.