"Appointment Booking Procedures"

This is not regarding a visit but your appointment system. My wife , who has dyhasia and onset of dementia, received a call for someone purporting ot be from the cancer breast clinic . After confirming her name, my wife passed the phone to me when I was asked for her D.O.B. , then her postal address . As we had no way of confirming the call was legitimate ,and no form of confirmation was forthcoming it was agreed that I call the unit back . After confirming the correctness of the number I called back . After hanging on for 20 minutes I was given the option for a call back which I accepted. We are all being told not to disclose our personal information without cofirming who you are talking to ,as these are the techniques for harvesting personal details .Couldn't your team establish their authenticity by actually suppling some known details i.e. last Hospital admission, patient's post code or G.P. Thus establishing a 2 way exchange of confirming identity .