Death Benefit

My mother M Nkoane app**** for a death benefit for my father who pasted away 2010, until today we have been taken from pillar to post regarding the payout. We where told that we need to go to Home Affairs and also get affidavit of the name changes on my late father's ID. That was submitted in July 2015, we called the call center ref no 685846 and where told that confirmation was received from Home Affairs. Then we made another follow up after 2 weeks when no money was paid out and this time we were told that they didn't get confirmation. This has taken too long and every time we call a different story is told by the pensions. We don't know what to do anymore. Please help