8 months and zero compliance to pay out monies of a deceased estate

The executor of my father's estate have been trying to have his accounts closed and the money transferred since 4 October 2022. More than 8 months later, after sending numerous emails, submitting all the necessary documents and visits to branches, there is absolutely zero compliance from the bank. Client Care also non responsive with failed promises of getting back within 2 working days. We are fed up with the bad (zero) service and compliance of this bank.