I agree with those who advise that you start dealing with the cats. I had a business in an inner city area of Melbourne years ago and the strays were multiplying fast when people began to feed them. There were first two then a dozen. I had to catch and transport the cats to the RSPCA. Your council will lend a humane trap to you and you can take the captured cats to the RSPCA where they will desex and find homes for them. (Please make a donation to the RSPCA if you do take cats to them.) You could also put pressure on the NSW government to change the cat roaming laws. Roaming cats do incredible harm to each other and to wildlife.