Standard bank

My father was ****ed in 2000 leaving our mom with us. He had a funeral policy with Avbob, he was covered for R20000. My mom learned that my father made my then 5yr old sister a beneficiary. Avbob gave my mother R10000 to bury my father and gave her a R10000 cheque to save for my little sister. My mother opened an account at Standard bank under my baby sister's name. Unfortunately my mother passed away 2yrs after my father. I became my siblings forster parent. When my baby sister was 17yrs old we went to the bank to check on her money but we were told that no money was ever deposited into that account, only the R50 account opening fee. I have the bank deposit slip and all the documents from Avbob but there's no money.

We were referred to Standard bank Ombudsman but they couldn't help us. They said once the account is inactive for more than 5yrs, it automatically gets cancelled. My sister is now 25yrs old.

Please help