Greetings.
I am sorry I came on this thread. Alas, ignorance is not the solution for this problem, and in my opinion, hard as I am trying to not let my passion fly in wanting to massacre those sordid friends of yours, you should definately contact any sort of animal rights personnel. How old are your friends, for if they are adults more serious measures can be taken. If this is not taken care of they are going to be stuffing humans in microwaves next and will probably not survive in the world due to many sorts of troubles they would get themselves into. I love animals, and detest humans that treat them poorly. Please, for the love of the hamster and for the love of your friends, inform a mature and responsible audience of such troubling misdemeanor.