Absa National Deceased Estates - Inefficiency and Delays

I am at my wits end with Absa National Deceased Estates. I am the executrix of my late father's estate and require his bank account balance of his existing account to be transferred into his estate late account (also with Absa, unfortunately). I have provided each and every FICA document as and when it has been requested and have sent numerous emails which have not been responded to (in particular, I have sent three emails since 10 January 2018, and not one has been responded to by email or telephonically). I have to call in myself every week only to hear that the matter is no further progressed. I am extremely frustrated. I need to pay the estate's accounts and cannot do so until the funds are released into the estate late account and all the accounts are now overdue (I have expressed this in each of my emails but received no response). Shocking and unprofessional service from a bank that holds itself out to be one of the best.