Tober, any legal avenue you want to pursue would take awhile given this is nuisance that we're really talking about. I'd recommend that you contact them as a first port of call, and then if that didn't work, write a formal complaint, then if that doesn't work, follow it up with the relevant authorities. The police will be able to pop around if the times they do this are at ridiculous times of the day - like at night or whatnot. If not, the police should be able to advise you as to how to proceed to take the matter to court. Generally though, the court process takes awhile.