Can you lengthen veneers without having to replace the entire veneer?

When I was in high school I got veneers for my top front four teeth, which were always too small. Being a perfectionist, I thought they seemed uneven and filed them down on my own. Years later I still regret my actions and wish I had kept them at their original length as they are now much too short. Is it possible for me to lengthen my veneers without having to replace them, and would it generally cost the same amount as it did originally?