Poor Service and Unprofessional Conduct

I'm complaining on behalf of my sister whose husband died on 23 Dec and claim lodged in January 2021.....its now close to 60 days and they have not resolved claim for life policy. ..on Policy ***......The keep asking same documents 3 to 4 times causing unnecessary delays......Complaint to their Internal complaints department resolved nothing and to Ombudsman as well......Surely the payout must now include interest on amounts due as their motto is 30 days from submission of claim.....Sp accrued interest must also we be paid .....as the family is living on credit or borrowings.....DONT TAKE OUT ANY POLICIES WITH THEM