Not getting plan speeds

I have the 1gb plan, but when connected directly to the modem I don’t get more than 750 on a good day. This is true day, night, morning, afternoon, so I don’t believe there’s a network connection issue since, I never got the 1gb speed. The troubleshooting steps didn’t fix it and the speed test doesn’t offer actual solutions. How can we get a support ticket to look at this, since there’s no way to open a support ticket if your network is working at all.