I don't think this is just about them being aware or unaware though. It's more about getting the rug pulled out from under you, when you had been working and paying your NI in good faith.
In April 2010 is when the transition began. Before this date, women could still retire at 60.
I was born in 1969. I started work in 1986. So for the first 24 years of my working life, I was paying NI, assuming I would get my pension at 60. Turns out I'll only get it at 67. So I have to work 7 years longer, and I'll receive £84k less. That feels like a piss take. And I'm not even old enough to be a Waspi woman!!
Funny how no one was ever given the option to not pay the element of NI that goes towards pensions. It's just been a case of the Government saying "Yes, we changed to goal posts, but we did tell you, so that makes it all ok". No, it's not okay! No where else in life would this be acceptable. "Yeah, I spat in your dinner, but I told you, so it's fine!"