We had a hoarder who literally had every room in his unit piled high with garbage 4-5 feet high. To enter his unit, he had to climb through a window to get in as his rubbish wouldn’t allow him to be able to open his door. He was on the ground floor
The only thing I can think of is the place is a fire hazard and you perhaps can report it to the local fire department to investigate and maybe they can enforce something.
For us, our hoarder got stuck between his front door and garbage on the inside and he was found dead a month later.
A neighbour detected a smell emanating from the unit and his body was discovered by the police. They had to break in through the window to discover the body. Sad story.