Unhappy, depressed client

Im now at a point of not knowing what else to do cause we have been sending complaints but the only thing we have ever received was an apology with no action taken towards our complaints. Hyde park standard bank is the worst place, i do not recommend anyone to do their will with standard bank nor have an account with them. It is now a year since my grandfather passed away and even now as his beneficiaries we have no idea how much he has/had in his account, everytime we request a statement we are ignored. We were never even formally approached regarding his will nor called in as the beneficiaries to discuss everything, we havr been the ones running after standard bank but with no help... The estate is being handled by Sbahle Dlomo and Dannie Du Toit and the way things are going on at the moment we even starting to wonder if ***** is being done hence we not even given the right to see any statements towards my late grandfathers estate. At the moment we wanted to at least install a tombstone for my grandfather but all the emails iv sent to Dannie Du toit have not been responded and its sad that its been a year and my grandfather's grave looks like he never had money. I need help on this, me and my family don't know what else to do regarding to standard bank as the executors of my late grandfather's estate