Incorrect deposit into account

There was an incorrect payment done into my bank account but due to the fact that I am under debt review I cannot have this amount transferred out, as I have not been using this account for the past year. I called FNB on numerous occasions to ask them to please have this funds transferred back to the inidivual who did the transfer, as this guys keeps calling and messaging me everyday for his cash. FNB promised to have the transfer done as soon as I send an email for ********** which I did, 2 weeks ago already and no transfer has been done yet. Please please is there anyone at FNB that can assist me to get this guys money back to him. I really need to have his cash given back to him and FNB keeps giving me the run around.. I cannot find anyone who is willing to assist me!!!