Don't want to pay Funeral Claim

My sister had a funeral policy with Old Mutual. She passed away in 2020. When trying to claim it was said there is no beneficiery and we need a letter of authority. After a long process we finally got the letter of authority. When going back to Old Mutual it is now said I am the beneficiary. When i want to claim, it it being said no I am not. It is now an ongoing of Old Mutual not wanting to assist with the claim. There is also an education fund policy to claim where sister child is now 18 and it is also being said I need to claim then its being said he needs to claim himself. This is the worst pathetic service ever!!!!!