If you find letters like this in your house, you know you live in a bydlo shithole commieblock.
Summary for non-Germans: there is a guy who abuses and allegedly beats his wife and she is crying loudly for help everyday, but nobody knows which flat exactly the cries and noise is coming from. The person who wrote the note must be a neighbor or something, that person already called the cops multiple times, but as they don't know which flat those people live in, they couldn't do anything. Basically the letter is asking everyone who hears this and knows where it's coming from to call the cops to help the woman and her child.