Christians why did this happen to me?

I was sitting in the car waiting for a family member who was at the store and as soon as she went into the store, I heard a demonic voice say hello to me from the penger side of the car. It was the most ugliest voice I ever heard. it made the the hair on the back of my neck stand up. I said get behind me in Jesus' name and it went away. I am a very devout Christian if that matters.