When a person phones you up out the blue you have no idea WHO they are, even if they say they are a claims company.
If you spend 15 minutes on the phone filling out the form then you are giving away loads of personal information (name, address, phone number, who knows what else) that could be used for all sorts of dodgy reasons such as getting out a loan in your name.
I work on the principal that I NEVER deal with anyone who phones me up out the blue.
If you work on the same principle you will never get scammed.
Please don't be gullible.