Company messed up offer

Applied to Senior EA role. After 1st interview we discussed title and pay, works for me. The whole process i meet 4 people to discuss me coming on as the next Senior Ea. Finished final round Thursday. Friday the recruiter called «  they loved you and want to move fwd however we have a bit of a situation » Role now should be only EA vs Senior EA because other Senior EA have 25 years exp and you don’t so its not fair to them… um what about skills degree and certifications? Told it doesn’t matter all that matters now is years of exp and title of the executive you support ( which is high up exec). Salary is lowered . Asked for sign on , she said we have 3 other strong candidates so we won’t do sign on. Asked about rsus im leaving behind and she said «  thats up to you. Not out problem » lol. Basically she said take it or leave it, no negotiation. She was so cold and short vs being nice and supportive since day 1. I have a feeling she messed up since the beg and this should have been EA and she is covering her ass. Anyways i cant take this offer its a demotion from my current role and from what i applied to. Demoted before hired. What would you do? I am tempted to email the HM and tell them directly why i will decline this offer and include all details above. Also would be curious if from now on their Senior ea role will require 25 years of exp? This is ridiculous.