Which internet speed test do you actually trust?

If the wired number tops out around 94 no matter what, look at the cable and the port, not the ISP. That's what a link stuck at 100 Mbps gives you, usually an old or damaged cable or a port on an old laptop. The network adapter status in Windows shows the link speed, it should say 1.0 Gbps. Also run it in the evening as well as the morning. If only evenings are slow, that's congestion on their side, and that's the strongest thing to complain about.

The test matters less than how you run it. Plug a laptop into the router with a cable, close everything else, and run it a few times across the day. Wifi alone can halve the number, which is probably why you're seeing doubles. Ookla's Speedtest is what most ISPs recognise, and you can pick a server close to you. Netflix's Fast test is good as a second opinion since it measures to Netflix's own servers, closer to real streaming. If you're going to complain, screenshot several wired results at different times. A single wifi test is easy for them to dismiss.