I do not feel that this qualifies as an expulsion, unless the behavior gets repeated. I would tell them that they should not bother the neighbors and apologize profusely for your phone unexpectedly dying. And also alert your neighbors that if any guest is bothersome, then the neighbors should contact you immediately, so that you can address it.
If the guests make it through the night without 'freezing', they may turn out just fine. Guests do have a right to a comfortable temperature in their lodging. They may decide on their own that the temperature is not comfortable enough and will cancel.