Not sure why you are so upset at what was predicted ( and pointed out ) , you can’t stay on Gfast , so if FTTP isn’t available then it’s FTTC or mobile or nothing , if FTTC speeds are insufficient that’s unfortunate, but puts you in no worse of a position than many others , if you ‘insist’ that you remain on Gfast until a better alternative is available, then apparently that’s not possible and it’s not your call to make , although you taking a PSTN phone service with your Gfast , and the removal of PSTN , has probably quickened Gfast demise in your case , the BT obligation to maintain your telephone service (which can’t be done with Gfast without PSTN ) means you are moved to FTTC because otherwise your claim would be that BT removed your telephone service without permission .
Clearly your price should reduce to reflect the fact that you are on FTTC and not Gfast , and as this change wasn’t of your making presumably you can leave penalty free , but you do seem to be railing against reality, Gfast is sunset technology even if you want it to remain it’s going to cease , PSTN is in the process of retirement and Gfast (even if it were not a sunset technology) cannot maintain your presumably still needed landline telephone service .
As far as you wanting to leave BT because of this , that’s fine , obviously if you still need telephone and broadband and Openreach are the only viable option it will be with FTTC and with IP telephony.
