Ongoing speed issues

I spoke with Xfinity support at least twice earlier this week and had a ticket opened to have a tech come out. At the time, I was under the impression the tech will check the neighborhood node but I kept on getting SMS messages about the appointment and subsequently it sent a message saying that "Through routine monitoring of the health of your network, everything looks good. If your issue is resolved, you can reply X to cancel your appointment" which I did because how is supposed the tech help with my home infrastructure?

I am really sick of support going by scripted questions and responses. The support has pushed for Xfinity modem however I will not even consider it (wouldn't even touch with a ten-foot pole). My infrastructure is as follows:

- Enterprise grade switch

- Enterprise grade router

- Enterprise grade Wi-Fi access point

The support kept on asking how many devices I have in my house that are connected to the internet. How is that supposed to help? I mean I do have some IoT devices but they all consume small bandwidth if any at all. Earlier in the year (in springtime) I complained and had a tech come out here and he admitted that the issue is really with the neighborhood infrastructure and nothing he can do about it. Eventually, I got a notice that infrastructure was being upgraded. As a result, I asked for higher speed tier (1,100 down / 300 up). For a time, I was getting constant speeds so I stopped checking but in the fall I noticed streaming service at times glitchy video streaming and / or buffering. I decided to start checking speed test at interval and noticed my speed is inconsistent throughout the day. At times I get over 1200, other times especially in the evenings I get half of that or even worse. Last night I was getting around 17mbps download and I had a specific device that needs to be updated (firmware) and it took at least half hour when it normally would take a few minutes due to extremely slow download. Please note that whenever I do speed test, it is done on my desktop that is connected via wire at 10,000mbps and the switch is connected to the router at 10,000mbps. The modem is connected to the router and its port is rated at 2,500mbps so we can rule out issues with my home network infrastructure.

Since I was "forced" to do a contract with Xfinity when I upgraded the speed tier (1,100 / 300) and I see that I'm not getting what I pay for so that is a breach of contract. I am once again documenting speed test results and have already asked for partial credit for this month. The support indicated the node may be the culprit due to too many devices connected to the internet and I told how is that supposed to be my problem? Xfinity needs to deliver what it promised and while I do understand during peak times I may not get full 1,100 download but getting around 300-700mbps and in certain cases below 100mbps is simply unacceptable and I consider it to be a breach of contract.

Now I am waiting to see if Xfinity support will see this message and ask me to contact them. Phone calls with support seem to go nowhere and the person on the other end kept on asking stupid questions. I'm in IT, I know network and such; they cannot point to my network infrastructure especially if my network runs at 10,000mbps whenever given device is capable of. I will keep asking for partial credit every month until Xfinity figures out the issue and I think I will have to start looking at other providers because it takes MY time to reach out to Xfinity support via telephone and such. It's becoming tiresome. If there is a better provider, I will make the switch and will not be responsible for ETF given the speed issue and on Xfinity's part for failure to provide expected speeds (again I point to breach of contract).