I would like to inquire about mole removal.

About five years ago, I had a mole removed with laser, but it didn't go away properly. The removed area became raised like a scar, and it took a long time for the scar to disappear. However, instead of disappearing, the mole split into several pieces and came back. Why does this happen? I want to remove it again, but is it possible to remove it cleanly? It's a mole that gradually darkens from within the skin, so it's impossible to remove it all at once, right?