Internet/Xfinity App/Assistance

Been paying over $300 per month for Xfinity. Internet is super slow mostly. Had Technician over and he couldn’t resolve issue. Xfinity app is horrible. Says I’m connected to Gateway then says my device is sleeping. “Assistance” is ridiculous. Can’t even run a speed test at times. New router didn’t improve internet. Tech said we quality for two free boosters. Xfinity said we don’t until we receive an email from them. When we call Xfinity you practically have to yell AGENT multiple times to get someone live. Running out of patience. Not sure they really give a hoot. We’re just one customer. Recently ran a wi-fi troubleshoot on their app. “Couldn’t deliver” a few times because it takes some internet speed to run the app. Sometimes speed is pretty good. Other times really slow. Very inconsistent. Why?