What type of carpet is it?/Do you have access to other sections of carpet?... Im really not sure how, but i've heard of people just cutting squares of carpet out and replacing a damaged area, without it being noticeable. So if you have a friend or know of a room with a similar carpet, start ripping it up
. Like i said, i really have no clue how this is done, only heard of it being done professionaly, definately check out some home improvement how to's.