Partial Internet

When I replaced my tv boxes (because the old boxes no longer had DVR or On Demand) I lost internet upstairs at my home. I had a repeater or amplifier hooked to a box. Comcast sent a tech and he gave me a wireless box so we can watch tv and moved the modem downstairs. I still don't have internet upstairs or outside at my generator. Comcast approved an appt with a tech. They cancelled it the day before the appt (late June) because they said that I have internet. So, I spent another two miserable hours to get another appt scheduled. They cancelled that one the day before also (mid July). I am now trying to reschedule that appt. Any recommendations?