suspect fault in granite worktop

    Hoping for some help/advice - we had a new kitchen fitted before Christmas with black granite worktops (African Black i think). It all looks great apart from the fact that there are some what i can only describe as "chips" in the worktops. The largest one is about the size of my little fingernail and feels rough to the touch. The kitchen company have been out to inspect and told us that these are natural pits and pores that occur in granite. However, my understanding of pits and pores is that they are tiny holes in the surface that will not be noticed on a large piece of granite (this piece is about 1 mtre by 2.5 mtre)as the surface is polished. Am i correct in my thinking? any replies would be much appreciated. thanks