Urgent: Rent deposit dispute

Hello All,

This is urgent.
So, my agreement is until end of April but I'm leaving the flat in the end of March.
The landlord (pretty known, owns the whole building) refusing to return the deposit amount (1 month rent) as we are leaving 1 month earlier.
There was nothing like that in the agreement.
I'm having a meeting with him tomorrow.
Let me know what can I do to get my full deposit back. What are my strong points?

Thanks

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