Unauthorized blocking of funds

I reported a possible ***** case to standardbank on behalf of my elderly impaired mother. The ***** happened in 2021 amounting to R500000 approximately. Standaardbank never raised any red flag on this matter nor did they ask any questions or block the account. However when i asked them to investigate what happened in 2021 they blocked my mothers account without any notice or warning. They say this is the process when they investigate yet we were not warned that we will need to make alternative plans to feed our mother since we wont access the money. Yet they havent started the investigation because they do not have permission to investigate but they gave themselves permission to block the account. As a result the old lady has no electricity no food or money to pay the helper. People are suffering yet standardbank is sitting with a case and money they are not investigating. They say we need to go to the branch to unblocked yet they they blocked the account from an unverified email. I have explained that my mother is not well and can not go to the branch yet i remain without any help or response from the person that blocked Lucky Mosiane.