How to deal with Toxic People?

Marinaughty
Hi all, I'm sorry in advance for a long post.
I'm sharing the house with 3 people ( I don't know them n they're from same country). When they first moved in I made it clear keep voice down after 3 A. M, here we don't share anything. However they keep on eating my food, bringing strangers to the house without notice in advance, partying untill 3-4. Our apartment just lost some stuffs a week ago. Last night they partied again without notice, one of their new friend just entered my room without knocking n when I asked who's there he just runs away laughing with his friends (I have my lights off). I caught him red handed n asking for an apology. Suprisingly he was like what's the fuck is wrong with me? I literally have a verbal fight with him n his cocky attitude just drives me so mad.
One of my Flatmate even try to enter other people room when they're not home in front of my eyes. What if they try to enter my room when I'm not home aswell? I feel very unsafe in my own house.
I think I have culture shock, I thought if you respect others they will respect you back but no it's not. I've lived with German, Spanish, Chinese, lots of people but never had any problems, they all very respected personal space n rules.
PLEASE GIVE ME SOME ADVICES HOW TO DEAL WITH THEM.
P. S: I can't move out yet because I live in Madrid n I'm currently changing my residency card so the government will send legal notice to aprt.
THANK YOU SO MUCH FOR READING MY POST. ANYTHING IS APPRECIATED
How to deal with Toxic People?
Updates
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UPDATE: Hi everyone, after reading everyone suggestions, I called my landlord, put my food in my room, lock the door everytime, talk to them, tell the most problematic person to move out, I tried what you guys suggested n it works. The most problematic one will move out this weekend. Thank you so much for helping me out n tell me what should to do on solving problems in life. I really appreciate all the time you spent on helping me.
How to deal with Toxic People?
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