A few issues arise; -
1. If your previous attempt at a repair was incompetently executed you may have compromised your position.
2. Unless your previous attempt at a repair was the subject of a joint inspection by a competent building professional and the remedial works agreed wit ha representative of teh management company , you may have compromised your position.
3. If the foregoing issues are all against you but the current ingress is from a totally new source, you may not have compromised your position, but you should do it by the book this time.
4. In newer buildings water ingress from outside may be dealt with by guarantees/ insurance policies from companies like Homebond. Check and see if any such policy is in place.
5. If the water ingress comes from a services leak within the building then the apartment or building insurance policy may cover it.
6. Interstitial condensation can also give rise to what looks like damp ingress, but may not be. This may arise from several sources and as a result fall into a gray area for insurance purposes.
7 In all cases, the damp must be traced to its source and its source removed. This may involve
- re-pointing the external wall
- re-rendering the external wall
- re-fixing and sealing loose flashings or parapet blocks
- increasing the insulation
- providing new or sealing the existing vapour checking the internal room
- increasing the ventilation either interstitially (in a cavity for example)
- tracing and sealing a pinhole leak in a supply pipe
- tracing and sealing a leak from an waste water, rain water or foul water pipe or outlet
etc.
8. Sometimes the apparent damp ingress can be the result of a change in living circumstances within the apartment, such as new people staying increasing the amount of water vapour in the air due to living processes like washing or cooking, etc.
9. "Wear and tear" on a building should be provided for by the sinking fund, which normally replaces items like lifts etc, but may also cover weathering repairs, services renewal, etc.
10. Whoever ends up paying for it, consider getting a building professional involved to photograph and record the matter under investigation, oversee the remedial works, advise you generally and assist in focussing the management company on the serious nature of the problem.
Hope this helps.
ONQ
All advice on AAM is remote from the situation and cannot be relied upon as a defence or support - in and of itself - should legal action be taken.
Competent legal and building professionals should be asked to advise in Real Life with rights to inspect and issue reports on the matters at hand.