Confidential Client Information sent out

Following frustration points received today with Nedbank Home Insurance Claims division<br> 1. Wiated for almost 20 minutes on call line waiting to speak to operator.<br> 2. Eventually called their ***line and was put through<br> 3. Requested a Claim form to be sent so that I could complete : Only to receive an already completed claim form from another customer.<br> <br> How can the bank so easily send out their customers confidential details to other clients? <br> I now hold information from another client being their names, telephone numbers, bond account number