Dissapointed at Eskom Pension Fund - Non payment of full Pension!

I have been communicating with the Eskom pension fund for the past almost 4 months. MY mother worked for eskom for just under 4 decades and recently decided to retire. She chose the option of the maximum tax free amount as pay out which is 500 000. She was not paid this amount and following up on the reasons we were advised She needs to go to SARS and find out why she was taxed. I refused to go to SARS or for my mom to go to SARS as she never dealt with SARS in the years she worked for eskom. Now they have just stopped replying and we requested to be put in touch with eskom pension fund administrators that too is not being provided. To think that both my parents decided so many years of thier lives to eskom and be treated like this in the end is not acceptable. I still await someone to help us get my mother's rightful pension money paid to her. I'm afraid this is going to be the case with my dad who will be going on pension soon from Eskom as well. I'm very disappointed!