Old Mutual non payment

I app**** for payment of my RA in October last year - 2021. It matured in my birthday - 11 October. Since then, between myself and my broker, we have submitted every document required by Old Mutual and we have tried unsuccessfully to get information through their customer service centre. The only thing we got from an almost illiterate representative was that the matter had been escalated. It has now been six months and still no payment of my RA. Now I’m going to start demanding interest on the money owed to me as they are getting interest in my money that sits in their account. Absolutely diabolical. I’m furious.