Bad service I am receiving from Nedbank

On the 29/08/2025 I collected my kids' debit cards from the Nedbank branch in Baywest Mall, only to find out that these cards aren't linked to their accounts. How do you issue cards without linking them? Enquiries 101! On the same day I call the contact centre only to be told that i need to make contact with my private banker, she will link the cards. The lady at the contact says she wrote a request asking the banker to call me for the linking. I also wrote a complaint, the banker eventually calls, apologising, promising to do the linking, till today that has not been done. I wrote another complaint on 13/10/2025, that one as well has not been attended to. So, what must happen now for these cards to be linked? Or should I rather take my business elsewhere?