CRUD, someone dented my rear door today

[Yawesh]

so i was parked at the mall, and after i got my Call of Duty world at war - i sat in my car thinking about shootin' some Nazi's down, when i see a little piece of paper folded up by my wiper

I already knew something was wrong, something had to happen and someone was nice enough, to leave me a message

That persons' door apparently hit me by accident. I should have taken a picture right away, cause i can't show you guys right now that it's dark.

The person wants me to call the number given to me

the dent is not just a nick.....about 1 inch wide and 2cm high paint is gone - but i'm more concerned on the dent. It looks like a double dent (like the ridges of two fingers of a brass knuckle. the middle of the "valley" is the paint gone.

it's quite noticeable, but not too crazy

i'll take pics tomorrow. my color is the dark greyish color

just need some opinions and what to do

i'm sure without a clear picture, you guys can't judge how much it will cost.