No Widow Pension Payout! Please Help Us

We are highly frustrated and feel helpless. My father passed away on 25/12/17 and we app**** for my mothers widows pension on 02/01/18. The forms were completed at the gepf office in Cape Town. The consultant checked forms and confirmed that everything was correct and in order. He advised payment would be made in 60 working days. When no payment was received a end March, I phoned the office repeatedly and was advised payment would be made shortly. On the 11/04/18 when once again phoning I was then advised there was an error on the z143 form (question D5 was incomplete). We downloaded the forms again, filled in again, send via registered post to Pretoria. We have now been informed after phoning once a week that there is no telling when payment will be made? My 80 year old mother has no income as from my dads passing. She is terribly stressed and anxious. All this after we were originally advised all was in order and payment would be received by end March! Please help us! We don’t know where else to seek help!