Reversal of Funds

My woman deposited money in the wrong bank account a few days ago. It was suppose to go to one recipient at Std bank and it ended up going to the wrong person at std bank. Now the branch told her that they cant assist her as the user of the bank account is unreachable and they cannot reverse the funds. I am sure there is something that can be done to rectify the situation. it's a lot of money that has been deposited and it needs to be reversed and put into the correct account. Please assist as the branch is not helpful at this moment.