Is Comcast ripping me off and how can I prove it?

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Do you use the Internet for work? Perhaps you can negotiate a business connection.

Consumer Internet contracts have no Service Level Agreement (SLA) and so, you can call Support all you want, but it's not their problem what sort of speeds you get to third-party sites, not even across their own backbone. The advertised speeds are signaling rates and not download/upload speeds. If your modem is displaying the correct lights on the front panel, then your connection is trained up at the correct signaling rate according to your chosen connectivity package, and your ISP won't care about YouTube.

If you obtain a business service, then you can negotiate a particular SLA in your contract, which won't necessarily make them care about YouTube, but you may be able to specify a minimum bitrate and uptime.

speedtest.net and the like, by default, will make use of a co-located server as close as possible to you, in terms of network topology, and so the speed results you obtain will be under ideal conditions, and indicate the maximum possible performance.

I had similar issues, such as everyone seeing my video and voice pause several times in Zoom meetings. Looking at modem stats, I could see that only kne of four upstream channels bonded, resulting in a tenuous connection. Ironically, the TV also didn't work well since each ca STB remote control button press requires a round trip to the server over IP. The result was that I'd be watching something and a non dismissable popup would cover the content to tell me there was an issue.

In any case, the only way I got them to stop telling me it was an inside wiring problem was to run an extension cord to the interface on the outside of my house where the wire from the street was connected to my home wiring and then connect my modem directly there. When they finally agreed to send someone, I was told it would be 7 business days.

Fios was able to install the next day, so I switched.

Try hosting a DIY speed test on a cloud server (like Google colab or the free oracle instances or whatever):

https://github.com/librespeed/speedtest

Also try a YouTube download with youtube-dl

Yeah, fast.com (which is Netflix) and speedtest.net are unfortunately not useful tests.

fast.com has anycast nodes on most major ISP's so they can be misleading when there is a problem on your network. Have you verified the duplex/speed settings have negotiated properly on each link of your LAN? What OS are you using? What is between your PC/phone and your Comcast modem? What make/model of NIC is on your computer?

I had a similar issue and switched my provider. Are there any alternatives for you?