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Sorry you’re going through this. That sucks.
That said, you should check your declaration and site map to see if your condo association is truly responsible for repairing the plumbing. Perhaps it is a responsibility that unit owners have? If you don’t know, you can ask your condo board. If they won’t reply to your complaints, try to look for them in person or attend a board meeting. This way, you can approach them personally. You also likely have a building manager or condo manager that you can ask for help.