Refused to transfer money back to my account

Hi my name is Martina Maditse and my contact number is ***.my email is [Email Removed] 2016.02.13 13.09 I mistakenly transferred the amount of 850.00 into this number *** and I was actually suppose to transfer the money to this number ***.i immediately called Capitec Bank on this number *** and I was told that the person received the money will b contacted and instructed to transfer the money back to me.on 2016.02.15 I was called by Capitec Bank and told that the recipient of the money is refusing to transfer money back to me. Can I please get help on what to do because I feel helpless.