To briefly explain my situation in chronological order,
I decided to rent this apartment in UWS, put up a temporary wall in the living room to live with my roommates. I asked my broker to confirm with the management about the wall and broker verbally told me, walls are okay as long as no damage. So I rented the place and put up a temporary wall which I removed when I moved out.
When I moved out, I wasn't able to do an inspection with my landlord because they didn't give me any instructions regarding the move out until the day before. I moved out and was waiting to hear back from the landlord regarding my deposit. After waiting for more than a month, I contacted the landlord who told me that all my deposit cannot be returned because they had to renovate the whole apartment. They said bathroom, wall, floor, and everything had to be redone, but the biggest reason was that I had a wall that was not allowed. I am pretty sure that the temporary wall didn't make any permanent damages to the apartment. Also, I am pretty sure what they call "damages" to bathroom, floor, and etc are reasonable wear and tear.
I feel I am being unfairly charged in this situation, at least I feel the apartment didn't need to be completely renovated. What should I do in this situation?