I'm sorry you got screwed over.
That never feels good.
The GA salary rates did go up recently but $100? That seems, at first blush, like a lot. The GA agreement is staff generated, meaning there are no active committees that deal with concession requests on a regular basis. The Chairs of the committees are usually the only ones consulted. There are those of us who would like to see this policy changed so I urge you to call the Business Rep in your area that made that concession, express your displeasure with the decision and then offer to serve on the committee. This may prompt a conversation about the actual committee and give you the opportunity to speak with your region's committee chair and ask that more input from the field be required before concessions like these are made.
I know you are very active in several areas of your profession so don't give up on this one, Erin.
You can make a difference!
Best of Luck,
VSM
Vernon