I'm posting in AIBU for traffic but I'd like some advice.
My elderly grandmother (lives alone and is mostly independent) has been tricked into giving her card details over the phone three times now. My dad and auntie have spoken to her at length about what to do if the caller is someone unknown and asking for card details (hang up and tell someone else), but she has again fallen for it this week and has had a large amount of money taken (thousands). She has a sign above her phone saying to never give out details and to hang up the call but she just doesn't seem to get it.
My dad has been considering taking her bank cards away, taking the phone away completely, cutting part of her cards off so she can't give the full number, and changing her phone number, but all of these options are either unfair, unsafe or a short term solution to the problem.
Does anyone have any experience of protecting older relatives or friends from this type of scam, or can suggest anything we may not have considered? Thank you.