My late mother's money that StandardBank is refusing to pay back.

I wrote a review about standard Bank last week about my late mother's money that they took and deposited into their account, i've sent all the required documents but nobody is willing to help, they just reply to the review promising to call back but they never do that&please I must not get the same reply even now, it's so sickening and I'm tired we've been claiming this money since May, it's not their money y is is so difficult to deposit it back? M taking the matter further maybe it's when they will take it serious.