That I don't know. They were from Canada. My friend that manage airbnbs told me that not give anything because I offer a really cheap place to stay. I will most likely get a bad review because of the internet even if I give that refund comes to $74.64 for overcharge.
He told me that if it was really that important then they should had ask to terminate the stay on the day the internet was done.
Plus the person already review me before I got the request for the refund. But I'm going to not refund nothing and move on from this experience and take the bad review because even if I give any money back that review stand.
But I did learn to get around this if my internet goes down again.