Premier Speeds

I have been a premier customer for some time now.  I have consistently only had 15-25 Mbps up and down.  This weekend I upgraded from an old DOCSIS 1 to the Netgear CG3000D from Cox.  I had to pay for the unit/upgrade even though it was supposed to be free via my phone call to Cox when ordered..  It was provisioned and is working properly, but there is no difference in speedtests via Cox internet tools.  This is a direct wired connection to the unit.  Any help would be appreciated.  Thx.