Send money to a wrong account.

I transfer money to the wrong person and that persons number is not working, we cant get hold of him/her to explain the matter, Capitec bank said we must go to the nearest police to open a case. The police said how can we open a case against someone we even know nor have the correct the details. about him /her and we then called capitec while we were in police station , we explained to them what the police officer was saying they then told us to bring a lawyer along for them to assist us.