Please help!!!! 2000Gbps service, only getting 400-500.

I had the same issue with the 1200Gbps service and a former employee mentioned that is was a provisioning issue and to change my plan to force a reprovisioning. I did this on Sunday to no avail I am still seeing sub 500. 

I have a Knighhawk CM20000  which should support up to 2.5Gbps; directly plugged into the modem though a  8Gbps cable and a 2.Gbps Nic I still only get 400-500 Mbps down 30-40 Up. Every time I call or chat they say its my hardware that could be the issue.. I am not sure how that is even possible when all the tests come back within range on my modem and I have a very modern computer. 

Please someone help I am at my wits end... I am paying a premium and getting 1/4 or less of what I am paying for.  

We are getting fiber in my area in about a year and I am seriously considering switching as soon as I can.