PrincessBluejay

So me and a friend are tenants of a small apartment area which is rented out ($60 Linden Rentals #1, Comporellon). One day my friend walked in to find two users she didn't know in her apartment. But strangest of all was the fact that they had been granted admin privileges. Neither of us did this. This is really concerning because they could have easily ejected us from our own home. What is going on here? Has this happened to anyone else? Any answers would be appreciated. Thank you.