Standard Bank withholding my money

Hi I've recently experienced very bad service from Standard Bank On the 8 August 2018 money was deposited into my now closed cheque account with Standard Bank, however they are now saying that since it is currently closed that are unable to trace the amount.. I find this hard to believe as the depositer has evidence showing that an amount was deposited into said account and Standard Bank which according to their process the amount should have bounced back within in 24hours, meaning that on the 9th August 2018 that amount should have been sent back to depositor, but no such thing has occurred.. I have approached a Standard Bank branch and had assistance from a consultant and a manger who also stated that they cannot trace the amount as the account is closed. My frustration is now directed towards Standard Bank as it is as clear as day that the amount is with them Why is my money being withheld?