My bill does not match my speeds

(3rd time typing this msg)

My plan says I have a 2gig package and my bill says I have a 2xgig line, adss $10, buy my broadband info in the xfi app and my speedtests show 1gig on a 2.5 ethernet port. Every page for ttoubleshooting is a loop and all change plan pages end in error and a "contact us" link that sends me right back to the start of the loop.

Why am I not getting the speed I am.paying for? And my friend who used to work for Comcast said I have a version 7 modem (grey bottom) when 1+gig modems are version 8 and have a copper bottom. He showed me his 1gig modem at his house.