What can I do about mice in my home?

Watch that old show called Tom and Jerry, it should tell you what to do.

I began renting a University property for my final year of University
and we have discovered a mouse problem from the first week we moved in.

On the first week of moving in, my house mate discovered a mouse in her bed. And several holes around her room. Pest control visited over a week later, and blocked the hole and put down posion.
However over the next 2 weeks prior to this, the kitchen began to fill up with mouse dropping and urine. Several times we spotted mice darting across the surfaces we prepare our food on.
We asked for traps to be placed down, which were promised - but they were never placed. The problem then escalated.

The mice began chewing through carpets of other rooms and entering them, by 2 weeks ago, (this problem has gone on for 7 weeks now.) I spotted a mouse in my room. It had got into my medication and began chewing it. I have found over the course of 2 weeks 6 mouse holes appear. I have blocked them with filler, so our landlord is threatening to charge me for doing so.
I bought an ultrasound pest control plug, but this hasn't stopped the formation of mouse holes over the past fortnight.
We have reported it to the landlord, and Enviromental health several times. E Health said we could pay £50 for our own private pest control. but as we've spent £50 already on filler and ultrasounds, we can't really afford to fork out anymore cash on this issue.

I couldn't sleep in my house anymore, so i now stay at my boyfriends, whenever I come home my room smells like a hamsters cage.
My house mate has found another mouse in her bed and several droppings in her bed. and we literally have had enough.
I've witheld the rent and asked to be relocated to another one of landlords properties, but they have refused, saying I need to replace my room first. (Who would move into a mice infested house? )

I don't realy know what to do, I'm in my final year of Uni and the stress of this is starting to affect my work. My Uni have granted me extensions but, how can I get out of this mouse infested house?

As much as I love cats, i am a full blown cat lady at heart.
I have considered this, and we are contracted not to have pets in the property.

Have you spoken to your student union/guild? This is exactly the sort of situation they're there for.

It isn't clear in your OP who your landlord is - your first paragraph states you're in a UNIVERSITY house - usually that would mean your university is your landlord.

Edit: also speaking from experience - humane traps and ultrasound do not work. Something like http://www.diy.com/departments/rentokil-mouse-control/189547_BQ.prd plus some peanut butter will help. As will keeping all food in plastic sealed containers.

Its Cleverstudentlets Plymouth, I've only asked for advice by the University but they have said theres nothing they can do except push it and report to council.

See, if cleverstudents had bothered 7 weeks ago to actualy deal with the problem than brush us of, I probably wouldn't be living with several mice chewing away at my house now.

For anyone looking to go for a house in Plymouth please stay away from this estate agent they're the worst

As much as I love cats, i am a full blown cat lady at heart.
I have considered this, and we are contracted not to have pets in the property.

(could argue we already have pets as we have a load of mice! )

Your landlord is supposed to deal with things like this within the terms of the contract. Its already been broken on his side. I would suggest perhaps borrow a cat from a friend or something for a couple of weeks if you can.

How have you contacted the landlord? If it has been in writing, good, if not, make sure all further communication is in writing. I would sugges you go and speak to the students union or the CAB and see if they can contact your landlord on your behalf... it might give the landlord the kick up the backside he needs to sort the problem out.