Banks should not handle deceased Estates

My father died 2016 march. Then there was a false WILL which had to be contested and it was end of 2016. Nedbank took my fathers Estate and they haven't done anything since. The will stated that nedbank should give us maintenance Us, give is money for education n trsnsport but have failed. I'm homeless and they refuse to approve funds for me to get a place to stay. We were supposed to get an advance for December we've been waiting since 27 November 2018 it's now 15 December 2018. Three estate officers have handled this estate but no resolution. The new estate officer never picks up my phone but when i call her colegues on the other line they inform me she is at her office. I have written three complains to ********** since november 2017 only got a simple reply but no action was taken seems it's getting worse. I simply want Nedbank to fufil it's promise, they must act reasonably, they must act within a reasonable time frame ( we should have recieved December advances by the 15 December ) they must give us maintance and wind up the estate. The estate owes nothing, all dept are paid and the executor has been paid. We are getting poor to no service at all, this is the worst experience of my life. We cannot get Nedbank to fulfil any of it's promisses.