X2 removed without consent

About 2 years ago, I signed up for Gigabit Extra with the XFi Complete package utilizing the XB8 gateway. At the time, I was getting advertised speeds of 1200 up and 200 down. About 6 months ago, I received an email that my area was upgraded as a result of the mid split work and Gigabit Extra customers would now be on the Gigabit X2 plan and the speeds that came with it. I was consistently getting over 2000 down and over 300 up which is what's advertised with the X2 plan. My bills also indicated I was on the X2 plan. About two weeks ago, there was a planned outage in my area. Since then, Xfinity sent a boot file to my XB8 gateway throttling my speeds to 1200 down / 35 up. I've been on numerous tech support calls and none have been able to fix the issue. Online, it shows plans speeds are 1200/35 even though I'm still under contract for 1200/200 and was operating at 2000/300 for over 6 months. 

Tech support is saying X2 is not available in my area despite 6 months of bills and speed tests showing otherwise. What's even worse is my promised speeds are slower than what I signed up for under contract.