Slow Internet Speeds

I'm currently signed up for Premier Internet service and am only getting 23.20 Mbps download speeds and 12.58 Mbps upload speeds. I've disconnected the modem and router as well as all of the TV's and cable boxes in series starting with the modem and router and done a manual reboot. I've also turned off all of the internet appliances that share a connection in the house. The speeds are still way slower than they should be.