Structural Issues with Condo

I bought my condo in May 2005, and not long after, I noticed something black on my ceiling. I called the contractor's attorney (he was the point of contact for issues at the time - no board members yet). He took a look at it and confirmed it was mold. After 3-4 months, the problem was "fixed." Since then, this has occurred 2 more times, and the contractor comes out to "fix" the problem. They said the cooling system would freeze and then form condensation. Everytime they insulate and patch the ceiling. The building is 5 floors and the only units that have that problem are the people above me, below me, and you see the pattern. Now, I found my whole wall covered in mold this past summer/fall. Contacted the contractor and he said this was not their problem. The next day, I get a call from the property manager saying there is a leak somewhere and they need to access my unit to find it because my unit may have been effected. That would explain the mold. This has been going on for months. The property manager always blames the contractor and the contractor is blamin the property manager. They finally came this past Sun. to remove the drywall and start repairs. The contractor thinks there is a leak from my neighbhor and the manager said something about a hole in the condensation tray (if that is the right word) in the HVAC system. My question to them was who was going to pay for the paint to redo my wall. I don't feel responsible for any of this and should not have to pay any out of pocket costs, and of course when I pose the question, finger pointing starts again. Do I have any recourse? It doesn't help that my condo is on the market and I have expopsed drywall, which is going to have a negative impact on my selling efforts.