Appalling service

So my dad passed away and all his accounts and house went into an estate. It has been over a year of his passing and still standard bank credit life did not settle on of his accounts due to some sort of dispute. Now I am confused what this dispute would be as they have the death certificate what more do they do they need to settle this account. In order for the estate to close their files they need one account to be closed by standard bank to finalise that estate.