how to get rid of mice

[The Yeti]

Ok I desperately need your help people as you all know we’ve had a bit of rain in Sydney recently, that combined with my neighbor finally mowing his lawn has caused me to become over run with mice, not inside the house, but in the cavities and up in the roof, last night the little pr/cks were constructing something in the cavity just behind my bead head

This problem has been increasing for the last week or so, I have done the usual like throwing those little blue baits around which normally give me 1 night of a blue bait round robin, mouse soccer tournament before all is quiet, but this time we seem to have a world cup and I’m going insane, so much so, last night I ratted through the garage found the demtel ultrasonic rodent deterrent and ran an extension lead up in the roof to above my bead room and left that on all night, still no better.

I need your help what have you guys used that has worked and worked well, I’m not against hurting these little - - - - rs I want them to pay for me not getting any sleep for the last few nights