Being the first few weeks of term, a lot of people will be dropping out of uni and a lot of places in halls and houses are likely to open up. You can email other providers and look at your uni's accomodation adverts to see if there are places available. Houses especially are likely to be quieter as it's usually not first-years in them. I was in the same position as you (moving in first-year), but in uni-run accomodation, and I was given the opportunity to meet people in the flat I'd be moving into to make sure they were more my type. Perhaps you can ask to do the same.
As for ending your current contract, you must insist to your current provider that the accommodation must be suitable for students to actually study in and get a good night's sleep. If they can't fulfill their end of the bargain by controlling the behaviour of the other students, it's not your fault and you shouldn't have to put up with it.
Best of luck OP, I know how horrible it is to live in a situation like this.