Sue them. You likely have a couple theories to move on. If they failed to notify LL of burst pipe they may be liable for some or all of the damage, repair, mold mitigation, etc.
See a LL-Tenant attorney immediately and start the process.
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The Disposition of Personal Property Landlord and Tenant Act (the “Disposition Act”) [see § 715.10 et seq., Fla. Stat.] sets out a procedure for disposing of property that a tenant left behind on the property. You can dispose of the tenant's property according to the procedure set out in the Disposition Act. If you are unsure of your rights and responsibilities under the Disposition Act, you should consult an experienced real estate lawyer in your area.
Disclaimer: This answer is provided for informational purposes only, does not constitute legal advice, and does not create an attorney-client relationship. Actual legal advice can only be provided after completing a comprehensive consultation in which all of the relevant facts are discussed and reviewed.
The lease agreement should govern most of this dispute. If you are uncertain of your rights and obligations, or if the agreement is unclear, you should meet with a landlord/tenant attorney for a consultation.