Frustrated client

My deceased father's account was closed after we reported his death with whatever savings he had in the account. Currently fighting with absa to finish the liquidation process however it has come to my attention that FNB is not giving them the certificate of balance and also the funds available. We have been waiting for the process to be completed for too long.. banks keeps on delaying us on funds that are needed to keep tht household going... my mother is currently frustrated about the issue how ever we have banks like FNB and Absa that are not taking clients seriously.