Renting from Property Legends

Signed a 12months contract with these people, knowing that my rent includes water, one month down the line I receive an email stating that I am liable to pay for water, mind you I still have screenshots from when I asked the agent that assisted me that says “water is included in the rent” so 1st December I gave in my 20 days notice to move out as stated on the contract that prior moving out you need to give in 20 days notice and I also paid my full month rent. So now I get an email that states that I will get penalised for early termination and they will be taking more than half of my deposit. Whereas I am entitled to my full deposit. I will be taking them to court and all social media platforms. I have proof of everything