Nedbank home loans doesnt apply lower interest rate

I have a home loan with Nedbank since 2003. Took a further bond in 2019. Got a phone call from Nedank Brits to say my interest rate will increase as I do not have my personal bank account with Nedank. This has never been the case before and was not a condition when taking the bond. Today 2/10/2024 I got a letter showing the new installment - even though the repo rate came down the letter does not reflect the lower interest rate and installment. Spent most of my day yesterday trying to get hold of someone - they kept referring me back to Lizzy at Nedbank Brits. Will be cancelling my bond (as soon as I find the correct email address to send the notice to).