Paint on the ceiling and walls is lot owner responsibility. The actual ceiling itself is OC responsibility. OC repairs the leak. Lot owner repaints the ceiling.
The lesson for you is that you should have left the ceiling unpainted before asking the OC to pay for the repaint. The Owners Corporation / strata manager needs to see that it needs the repaint work.
OC may reject your request because they have no evidence of what it looked like and they cannot determine how much that job should cost.