Non riesco ad ottenere un deposito per l'affitto

Hello, I am a foreign student. I live in Florence. I want to find out, I rented a house with a local agency. I check out on time in August. The landlord and the intermediary agency have been delayed for 3 months and have not received the deposit yet. Today I asked the landlord and he said that the cost of cleaning the toilet and the house is as high as 600 Euros. My deposit of 700 euros is fully deducted. But the agent told me that after deducting the maintenance and cleaning, there are additional water and electricity costs, and refunded the deposit of 390 euros. I asked the landlord to get a bill, but he couldn't provide it. Is this a fraud? Can I get help?