Sanlam refusing to pay out Retirement Annuity Death benefit.

My father passed away on 11th September 2021 and he had a Retirement Annuity with Sanlam & Liberty. He had appointed Millionsure as a broker for both these policies. Documents to be filled in & sent back were sent to ALL dependents in December of 2021. All dependents except for 1 Adult dependent did not submit back required documents for reasons only known to him & he has made it a point to NOT be contactable by switching off his phone for months at a time. I have made several attempts to talk to both liberty & sanlam since January 2022 to date about their duty to release funds within 12 months according to the Pension Fund Act but both have told me there is nothing they can do without the other dependents documents. I sought legal advice and was told that Liberty & Sanlam are just being lazy & unreasonable as they CAN release funds for all other dependents and withhold a portion for the non participating dependent until he decides to submit documents. Surely Sanlam & Liberty have dealt with similar cases & have found ways to resolve them. Must dependents be kicked out of schools while provision was made by the member to make sure his dependents are taken care of upon his death? I have asked for Email addresses for both Liberty & Sanlam Administrators/Trustees so I can lay a formal complaint with the Pension Funds Adjudicator but no one seems to want to provide those details. Pay out my late Father's money, it's been 12 months already.....why must all suffer because of your incompentency?