Your damages are going to be limited to either money you've spent or lost, you're not going to be able to sue your landlord for a large amount of money unless you actually suffered damages.
I would recommend hiring an attorney to recover your security deposit, either by suing or by sending a demand letter.
Legal disclaimer: DISCLAIMER: This response is for informational purposes only and does not form an attorney-client relationship. It represents only the educated opinion of the author. It should not be relied upon as legal advice. The response is based on the limited facts provided, and might change given additional or different facts.