When I was driving a taxi we were always fighting off bogus insurance claims from dubious characters. They see a taxi and know you have to have fully comprehensive insurance.
I had one, several other people I know have had them, they say you hit their car but never stopped. Mine was from a bloke called Mr Osman Ali, it went on for about two years, kept getting threatening letters. Then when I renewed my insurance I changed companies and the old insurer, Norwich Union paid him out! Without telling me first. Big money too, personal injury, loss of earnings the lot.
Then Norwich Union wrote to my new insurer and revoked my no claims bonus. That is one of the many reasons I am no longer driving a taxi. Just sick of the scams, you are just too vunerable