My neighbors always play music in the garden on sunny days, all day every day, but the past week or so the volume has got much louder. I've always found it annoying and have never complained but it's becoming unbearable, you can even hear it inside with the windows closed. So I asked them politely to turn it down a little, they said it's the kids speakers so that's why it's up so loud and started going on about the kids not being allowed to play in the garden. I said I didn't mind at all about the kids (oldest one is 6) playing, it was the music that was too loud. Anyway, they didn't turn it down, in fact I think they turned it up and I heard them saying to the kids that the should enjoy themselves and not bother about anyone. What would you do?