1200mbps connection, only getting 4mbps and support was worse than useless

So, on certain regions it seems like any connection is slow. For example, i did speed tests to servers in California, Texas, Alaska, Ohio (I'm in Michigan) and every speed test came back with 3-4mbps. 

I have a friend who lives 4-5 miles away from me and is also a comcast customer. I had him run the same speed test as me. And he got 100+ mbps. I compared tracert with him and the ONLY different in the trace is with the comcast hops. Once it leaves the comcast network it takes the exact same path. I'm certain it's not an issue with my home network because I tried it using my PC wired to the router, as well as using my cell phone over wifi. I also went and picked up a comcast modem and tested with that and got the same results.

I'm also certain it's not an issue with a loose wire or anything like that because when i do a speed test to detroit, or florida or new york, i get 700-900mbps. A faultly local connection here would give me bad speeds everywhere.

When i spoke with comcast support, they had me check a bunch of completely useless stuff - what browser am i using, how much memory do i have, hard drive space etc. After going through all those useless things (they told me they had to get that information to open a ticket) they then tell me they can't do anything because I'm not using a comcast modem. So - why waste my time with all those stupid questions if in the end you couldn't do anything? 

And after i went out and got the modem, which didn't help, they still did nothing. Like - literally not a single offer or suggestion to try and resolve this. Now they are sending a tech to my house which is also going to be completely useless. It's very obvious this issue has something with with comcast's network and nothing to do with a bad connection here.

I've also had 2 other people on reddit reach out to me also in michigan and they have the exact same problem.

So, how can i talk to someone who actually has some real technical knowledge and can figure out what the problem is and try to fix it? rather than wasting my time testing things that are obviously not the issue.