Landlord giving basement code
So when we went to look at this apartment the landlord was super nice. Of course he was he needed to fill a home. He said a lady with 3 kids will be moving above us. Come to turn out she moved 10 people in. I told the landlord this and he said I was crazy. But yet they have 3 cars and so much proof there is a lot of people up there. In the lease we have the basement and the door connects to my kitchen next to my bedroom. And the lady above has the attic which they use as a bedroom. So my problem is they blow a fuse all the time and they need to go into my basement because the box is in there. The landlord gave her the code to my basement we don’t have keys it’s digital. So now with the warm weather they keep blowing a fuse causing them to just let themself in my basement. I don’t like it I have expensive collectibles down there and I feel like someone is breaking in because if I’m napping I can hear them down there. What should I do moving forward?
Adding : thank you all so much. Gonna get a door bar after work and a wireless camera. Also for some clarity I know I made this confusing. There is also a door on the outside that leads to the basement. And from the basement there is a door that goes to my kitchen.