I lost the only parent i had cause of this bank

In 2019 my grandmother got sick and passed on in October. In 2005 my grandmother opened a funeral policy which she was told she will get R20000 for her burial but that didn't happened. Standard bank caused my grandmother's death. She's kept on paying monthly without skipping since from 2005. In 2019 around August she was discharged,although she wasn't full well she requested that I accompany her to standard bank westgate. When we got there the lady who was assisting us said she can't see anything on the system. There was R2000 in her account but the rest of the money was no where that she's been depositing since 2005. The lady then called someone who deals with policies. For One the lady was rude on the phone. She then told me to let her speak to my grandmother,she said my grandmother's policy has elapsed since 2017. I then asked why were we not notified and there was answer for that. I asked again if it elapsed what happened to the money she's been depositing?no body knows but how huh? The lady we first spoke to at the bank said she will request a statement from 2005 to check what happened. When we left the bank my grandmother was very Ill. It was on friday and then the next monday my grandmother was admitted and the doctors kept on complaining about her heart,her face was swollen,hands,etc. Had it not for standard bank westgate my grandmother would still be alive. She paid since 2005,she had hope that her children won't struggle to bury her cause she trusted standard bank she's been paying since 2005 to 2019. Up to this day standard bank has never contacted me regarding the statement so they ****** my grandmother.