You might need to write a Motion for your committee to review and vote on as to relocating the bins to a common part of the property and away from the area they currently are encroaching. This makes it a little more formal, and if they come back and say no the Motion failed, you then have something to take to the next level. In Qld if it were me I would seek adjutication to rectify your situation. Sounds a bit silly not to just shift them but folks don’t like change and therefor you need push back to make it happen. I’d also make a point of having your site boundary repainted to the correct spec also.