Livable space does not match advertised

[Janet Igo]

First, I do realize I probably made a huge mistake in purchasing a home without being able to see it in person. Yet, when your in a different State and trying to sell your home, and you must rely on the contract that you have made with a Realtor you have spoken to on the phone and a home inspector, your choices seem limited. Anyway, the home was advertised as 1400 sq ft of livable space. Which I asked repeatedly if this was so to the Agent and was told yes. The old carport had been converted into an addition and was now heated and cooled and considered livable space. Within day's upon arrival, I found that the vent to this addition is not connected to the HVAC. Estimated cost to have this done, is anywhere between $5,500 to $10,000. In addition to that, where this addition was erected to the main structure, it is pulling away. This was not noted in the inspection report. I have contacted both the Agent and the Inspect (which was recommended by the Realtor) and both replied it was not their problem. In addition to that I have also found that there have never been any permit's issued for anything for this home since this home was built, which per the building commission, makes the addition an illegal addition. So in short, even though my Agent kept telling me that I was getting 1400 sq ft of living space and I questioned it due to the appraisal said something different, I have about 1,000 sq ft with the other that may fall off. Not sure what I can do about it?