Liberty completely ignores family of my deceased father after collecting premiums from for almost two decades

I submitted a query to Liberty on behalf of my deceased father in December 2018. A Ms. Margaret Mokoena contacted me to let me know that Liberty would look into my query and that I would need to submit the letter appointing me as Executor of my father's estate- which I did once the Master's Court appointed me. Since then, Liberty has simply ignored my query- yes there's an issue with the claim, but I sent them specific questions which I think given my father had a relationship with them since 2001, they should respond to. But they have simply ignored me, save for sending me an email every time I call their call centre to say they will get back to me. It has been six months. Liberty is an awful company and I unfortunately have a policy with them too which I obviously need to review given how they are likely to treat my next of kin in the event of my death. Very disappointed in this company, just collecting premiums from people's hard earned money but failing to even respond to their next- of kin.