2 year agreement changes after 1 year

Mine has done the same we just started in april and our internet went from the 800mps plan to the ultimate classic which is 300mps which they dont offer anymore so I called everything was good they guy said ya we can upgrade to the 800 plan and then when it came time to do it he said actually it would void your conract and bundle so I have to stay at the 300 which wasnt in the internet +contour deal. So I have no recourse and they will never just do it because its the right thing to do and if a business messes up on there end wouldnt it be beneficial to fix it for the customer and gain a postive review which are really hard to find these days.