Bad service and service breakdown

My brother in law passed on in the beginning of March and we notified Discovery bank about his passing because he had an account with them. They responded by requesting the death certificate and his copy of ID which we sent and they responded by saying his account will be closed and whatever is left in the account will be deposited in the deceased account as they advised us to open one. Since the beginning of March we still haven't received that money nor communication from them since they've been giving us a run around and now the account is still not closed as we have been receiving notifications notifying deductions on the deceased account. I have been speaking to Grace Mareka,Moses Ngaka,Nomzamo,Caryn and Hlengiwe who was very rude.I want to notify Discovery that we want that money that has been deducted even after we sent them death certificate and the ID copy. We were played and traumised by such terrible service in our time of grieve.