Mice

I've lived in my new property with my four week old for just nearly a month now. These past 4 days I've spotted something in the corner of my eye which I've now discovered is a mice. I'm absolutely petrified of them! Even more worried as my little one is still so young. I got told by the council before I moved in that the woman that got evicted had rats and mice... Which I thought would of been sorted from the council before I moved in. Anyhow I've been running around the flat trying to catch which I think is more then one which I and a friend saw go into the kitchen we couldn't find it so my friend removed the borders under the cupboard and I can't actually believe the mess under them it's actually disgusting and the woman that lived here with a child is actually vile! And for it not to of even been cleaned up or even checked is disgusting to. I rang the council on Sunday to be spoken to by the rudest woman I've ever come across she spoke to me asif I wasn't human.. I'm not a dirty person my family support me a lot this flat cost us a lot of money to decorate now I have mice running all over makes my spine cruel. Anyway environmental health left me a message on voice mail yesterday and said there's a £35 charge? Why I've only lived here a few weeks this should of been sorted before I even moved in? So the council don't remove filth before someone moves in... But yet they left me to do Basically everything. I am not paying for something that should of been sorted before I moved in that's ridiculous I apologise but I'm so upset with the way I've been treated.