It sounds to me like you sense that you have a purpose in life, but you are feeling frustrated in accomplishing that purpose.  The chaos of the dream indicates the clutter in your mind that you are not keeping control of.  The fact that others have to let you on to the elevator with their employee badges shows that you have not learned to think for yourself; you are relying on the identities of others too much.  Time to discover and utilize your own identity!  The distractions on each "wrong" floor show that you are being tempted by other things in life that could keep you from achieving your true purpose.  But the good thing is that you are trying to stay focused on your ultimate goal, even though it seems to be blocked from you right now, and you are being persistent.
I'm not very good at numerology, but I imagine that there's some significance in the number 9.  Since "nine" closely rhymes with "mine," I wonder if the dream used that number to emphasize the idea that this goal you are trying to achieve is something very personal, something that is YOURS.