Eek!! We've got mice!!

Little perishers are coming in from the cold. Saw one on the hearth rug a few weeks ago. Bold as brass, he sat looking at me; he wasn't even scared of me.
We got pest control out and they put bait down. Then we saw nothing.
But now they are back. We tried one of those sonic high pitched noise things but pest man said mice get used to it and it doesn't bother them.
Can't get a cat cos much as I love em, I am allergic.
Think Ill put a sign up saying Mice Forbidden. That might work.