Hey craigtimm,
Thank you for reaching out! I understand the frustration of slow Internet speeds, some troubleshooting should be able to fix that right up. I have the same plan and get perfect results. It may be a signal related issue, I'd recommend trying some of the troubleshooting steps here if you haven't done so already to reseat the coax cable connections. Once you have done that, try a speed test here and let me know of the results on a direct ethernet connection from the modem to your desktop/laptop. Keep me posted.
Cheers,
Tony | Community Mod.