my dad worked for Impala platinum mine since 1983

Hello Peter my father worked for impala platinum mine in Rustenburg from 1983 till 2003 when he fell sick and passed away in September of 2003 my mom was only paid out the death benifit for the funeral i have been trying to trace if we weren't supposed to be getting our fathers other funds from the mine but i have been taken from post to post apparently the provident fund have no details of my dad ever working only Teba limited have his information i am stressed and lost on how to go about in finding out what happened to my father's funds because he worked for 20 years and only got R54000