The top roof leaking should be the management responsibility. Why should you pay for damage cause by the management inaction.

Write them a letter and INSTRUCT them to repair it and also pay for redoing any damage to your unit. Inform them if there is no action within 2 weeks, you will go ahead and do the repair with outside contractor and charge them for everything you will and might incur. cc copy to your local council and their lawyer.

Typical building management, take money quick quick, action no hear.