Advice on matter at Masters office Johannesburg

estranged stepsister of my late father submitted a fabricated ********** will claiming it to be my dads last will and testament and that she is the executor over this fabricated will, the matter have been dealt with in 2013/2014 but still this estranged stepsister's wrong doings towards us is prohibiting us as siblings to round of what is left of my dads last money after she stole and ****** us from everything else. the Masters office is really not helpful but abrupt. please advice how to deal with this matter