Don't think BC understand main reason why people are declining. Adding in more stock over 4 years might not be good enough. Staff do not trust BC or anything they are saying. The promise of a bit more money every three months won't change that.
At the start people were told welcome letters are non negotiable, BC changing just shows how flippant they are. If they can change offer letters so quickly, he-l knows what else they are capable of. The sudden switch is more thought for concern.
They have truly f**cked up showing how underhanded they are.
I hope employees in other EU countries get benefit of this in advance. That BC take this sh!t show into consideration, give respectable offers and stop playing with people.