Mondelez India Foods / Cadbury India — Dairy milk lolly

I recently purchased 4 Cadbury lollypops from a pharmacy in Bangalore. As I was eating the lollypop, almost to the end of I felt a stone like thing in my mouth, that cut my tongue and was bleeding. when I spat out the remaining piece if chocolate, I saw a blue pellet and examined the rest of the chocolate, to find blue plastic pieces.