2 gb service scamming With fiber modem and XB8 router.

The current setup clearly isn't meeting expectations but there's nothing holding you back from getting the provisioned speeds.  Having a 2Gbit connection allows a combination of devices to run simultaneously with little risk of slowdown.  You should for example, be able to run 2x1Gbit devices simultaneously with little noticeable slowdown.

Another option available would be to just purchase your own router that meets your specifications if you want 2Gbit speeds from a single device.

You are forgetting that the speed is shared across your devices. With 2gb speed, you should be able to utilize multiple devices with very little slowdown on them. Like ExtraChrispy said, 2x1gb devices simultaneously, or you can have a couple of your tvs streaming 4k and use your computer without seeing the tv's buffering. 

Has this been confirmed that the ports on the modem itself are limited to 1 Gb?  What's frustrating was that the Cox tech that came out to upgrade could only test up to 1 Gb due to the limitations of their equipment.  If a tech is going to come out to upgrade to 2.0 Gb you could think they would have equipment that is cabable of speeds that they provide.  I've heard this from other folks in the forums that state that the testing equipment is only limited to 1 Gb.  

Hello. You can find all of our approved modems and gateways list and technical information about those devices here: https://www.cox.com/residential/support/cox-certified-cable-modems.html

Please be careful with the link and language because the first thing the service described lists: “2 Gbps For an optimal experience on the Cox Fiber Network, a router with two 2.5 Gbps Ethernet ports is required. Other network architectures require at least one 2.5 Gbps Ethernet port on the in-home modem, router and/or gateway.”

Cox does not offer a gateway that supports this service. I have devices capable of connecting and handling 2.5GB service without the ability to use or maximize because the PW8 is their latest version and the 2 GB port is taken by the line input on port 4. 

some places Cox will not let you use your own router to optimize the 2GB service vice the panoramic gateway. I’m open to other options, but still seems shady.