...perhaps I should have said that the EU is refusing to negotiate further...
as you say, the EU negotiated in good faith with the government of the UK for more than two years, but the deal agreed by the UK government has been rejected by the UK parliament.
if you were the EU, would you now be offering improved terms to the UK government? or to someone who was not the UK government? Who do you think is competent to try to renegotiate?