Dissappointed in Assistance Received

During 2013 I as contacted by Nedbank Retirement Annuity Department regarding money from my deceased father's retirement fund that were to be paid out to the beneficiaries In order for this to happen they required a Tax Clearance Certificate for SARS. After visiting the SARS branch I was told that I need a Power of Attorney form the executor of the estate. I contacted the lady who phoned me and was told they do not have any info regarding the estate. I then went to the Master of the High Court in Pretoria to get the information I could. I then got the original Letter of Executorship. I then contacted Syfrets Trust Ltd only to find out they form part of the Nedgroup now and that the original appointed Executor is no longer in their system. I was then provided with the mail address of a lady who could maybe help me. Ever since then I have been referred to various people within the Estate / Trust Department and was told that the Estate files is no longer in existence and that they app**** to the Master for the documentation. Till date I have not yet had any real success or any clear cut response. Its almost been three years since the original phone all. Frustrated and disappointed.