Admin blunder costing me

Good day,

I took out an educational policy with Sanlam a couple of years back and now that I'm asking for a payout I'm informed they are not able to change banking details from my old account which premiums used to go from to the new and current bank account. I informed them that the old account is closed and no longer in use however they still giving me the run-around.

Regards, S Majoro