I know you will say down grade but if a go to the 500mb its only a couple pound a difference
There not known for looking after there long term customers been with them for 10 plus years on and of.
See if the New EE, can offer you anything better, because at the moment their prices are lower than BT's. And if you're lucky and need the speed, you could get 1.6gb for about £10 extra.
As has been posted previously on the forum currently the EE 1.6gb package is only available to new EE customers and not available to switches from BT. That will change but no date yet for BT switches
i pay 39.99 for 500 and have done for the last 3 years....still not great compared to competitors in my area, but you are paying way too much imo.