Un-Neighbourly dustbin use

We heard a noise last night. It sounded like our dustbins being used in the middle of the night. Later on we heard the noise again and my wife saw one of the squatters exiting the area where our dustbins are kept. This morning we checked our dustbins and discovered that they were full of rubbish - a mixture of trash & builder's rubble. The rubbish wasn't even put into bin bags. The refuse collectors may not even get rid of it because it hasn't been properly disposed of.