I had some neighbours who were playing music often. We share a wall and although it wasn’t always late at night, it was during times when I was at home wanting some peace and quiet. However all I could hear was doof doof from the wall!
My personal advice is to start escalating the situation. You’ve tried talking with them and it doesn’t work. Basically follow the advice on this website and the ‘Annoyed by Noise’ booklet:
https://www.epa.vic.gov.au/en/your-environment/noise/how-to-deal-with-residential-noise#neighbours
Ring up the Disputes Settlement Centre and try to get a negotiated resolution. If that doesn’t work, then I would say take them to VCAT.
Of course, while that’s all going on, have a go at seeing if the council, the police or other organisations are able to help. They probably won’t but it’s worth a try.
Please let us know how you go!