Told the landlord about one pair of keys going missing. Also about the door being unlocked when I came home, the lights being turned on etc.

He agreed to change one of the locks, the simple one that wouldn't be so hard for a burglar to open.

But how do I get some kind of stuff on my clothing and on furniture that wasn't there before?

Also the the stuff on the outside of the door, is clearly something someone has smeared on. But why?

Should mention that I have been harassed before. Someone taking a locked bike in the yard. Someone scratching my new bike... Then it got worse. I found shit on the saddle and someone had also punched a hole in it.

Almost the same thing. Kept wiping it off. Every day, new shit. Other people saw it and I also photographed it so clearly I wasn't imagining it.

After a while I "gave up" and stopped using my bike. Later this with the apartment started happening.

So if someone could give me some input how it's done or who's behind it, I'd be grateful.