Appointment cancellation

I had an appointment today to have my internet fixed after a storm. I’ve been without internet for almost a week now. I got a text that the technician was here so I went outside looking for them and they were not here. Less than 10 minutes later I got another text that said “sorry we missed you, your appointment is now cancelled” I took a whole day off of work for a no show. I now have to take another day off of work to be home for my new appointment tomorrow. Can anyone help me verify that they will actually show up and I won’t miss work for nothing again?