Unable to assist with a reversal of incorrect dep

I have mistakenly deposited money into an incorrect ABSA account. I was told by ABSA that they cannot reverse this transaction nor can they assist me... they have given me the account holders cell number and now this guy has put his phone off. Yes it was a mistake on my side but does ABSA not have any processes in place to help us retrieve our money in these cases. I do know banks like FNB etc can assist immediately. It is upsetting to know that such a prestige bank turns around and tells its clients they cannot assist. I was transferred to and from departments when i tried calling ABSA and received no joy as they told me they cant assist. i emailed ABSA and was only given the account holders number and told that they are closing my call. I am left clueless as to what processes to follow currently..