I don't think your laws are very strict over there so there wont be much you can do

But there are a few things you can do

Contact as many animal rescues as you can and see if they are willing to go over, look at their set up and offer advice to the owners.
See if any reporters who write animal articles for newspapers or magazines are interested to get some publicity. Failing that any other reporter, preferable both particually local papers.
Try speaking to the animals keepers yourself, but only do this is you can be very very diplomatic about at and definitely won't get stressed no matter how they respond to you.
Write them an annoymous letter outlining why the birds are suffereing and realistic things/cheap ways they can improve the situation for them. Quote and reference loads of facts like how much of the day they spend foraging, how social they are. Whatever is relevent to their situation. You could include pictures of good set ups vs bad ones for comparison.
If all else fails start a petition! lol
Best of luck helping these poor creatures.