Have you tried to catch your neighbor's cat and to use it against these mice? Seems like a great plan, lol. But seriously, mouse traps don't really help in some cases because mice have become really smart these days. In general, mice appear in dirty places or places with a lot of supplies, so you can clean your house extensively. If it doesn't help, I'd recommend contacting pest control specialists. I usually use this website - niftytilecleaning.com.au to get necessary about such services in my hometown. If you're from Canberra or any other aussie city, you can call them and ask for help.