Internet Connection Keeps Dropping

My Xfinity internet connection keeps dropping. I had this problem with my own router - the internet connection would go out several times an hour. I recently got a Gateway and storm-ready internet. The internet connection is still dropping. I get text messages when the connection switches to the cellular backup and back. I got the Gateway and storm-ready internet about a week ago and have at least 50 texts so the connection has dropped and reconnected at least 25 times. How can I reach someone to get this problem sorted out? There does not seem to be a way of emailing customer service and the messaging keeps trying to get me to do troubleshooting that isn't relevant and the phone seems to want to direct me to an inane "self-help". Is there a way to reach a real customer service person? I know that the service is dropping and not a problem with my wifi setup since it has happened with two different modems.