Good day I was do disappointed and frustrated

Good day I was do disappointed and frustrated. My mother in law passed away in 1998 and we came to know about her unclaimed benefits benefits from momentum in May 2024 and did our investigation and in June 2024 we submitted a claim. It's been over a year. Whenever my husband calls it's a different story and promise to call back no luck. This mere frustration. An agent at one stage said if the beneficiary does not call the file gets to the bottom of the list. Every time he calls they say call next week and the same thing they said will be repeated. At one stage they said they app**** a wrong date of death on a directive to Sars and they will reapply and send the request to be assessed. I sent a complaint it's been more than 7 days no response. What else can one do to get this resolved. Please help.