Sounds all too familiar. At least your caller got quiet. We were the victims of prank calls at 1 am from some kids who were making a pun on our last name and when I asked them to quit calling, they started calling back even more frequently but this time mocking my speech and asking for the "guy who talk funny" with a garbled imitation of my impediment. We had to disconnect the phones at midnight for a week to get rid of them.
and forget about calling any support help or customer service line that has been outsourced overseas. I quickly tired of "I sorry, no understand, thanking you for repeating please".