Chances are that company never did offer high-speed internet on their analog cable system, and they're not about to start now. The cable systems I've used for broadband used two different frequency bands. One was up around 775-800 MHz for the download part of the service, above the range where most UHF signals are. Most cable systems can cover frequencies up to 1000 MHZ OK, but some older ones never were upgraded enough to cover much over 500 MHz. The other, for the upload part, was around 5 to 45 MHz (below channel 2, etc.) in a region not used by TV. But this was for a signal generated in your broadband cable modem and sent back up the line. That meant that a cable distribution system originally designed to send signals through amplifiers in only one direction (from their head end to your TV) had to be modified at EVERY distribution amplifier by replacing it with a new design. The new one did the original job (send signals from 50 MHz to 1000 MHz down the line) PLUS and additional task - amplify and send signals from 5 to 45 MHz back UP the line. It isn't cheap to replace every amplifier in a cable system for that purpose, and some systems dimply never did the upgrade.
Have you checked out broadband service from the phone company? I know it has some limits based on your distance from the switch or exchange building that serves your phone, but some are very good. In our home we have ADSL service on our phone line and over the years, with no change in price, they have sped it up from 4 Mb/s to 8 Mb/s and it works great. ADSL modem rental (and free replacement of failed ones) is included in the monthly fee added to the phone bill. In fact, in effect it has replaced cable TV in our house. We canceled cable service outright a year ago and use a dedicated computer to download all the programs we want from Torrent servers via the ADSL service, then watch commercial-free programs on our time schedule, not theirs.
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