Breach of contract!
Know any good lawyers Borneo?
You entered a good faith contract twenty plus years ago despite what a possibly young recent hire claims to know of AMA history.
Edit: Sorry, I really have no accurate info for you. Just sympathy as once again we find out the "ground rules" have seemingly changed not to our benefit.
I still get a kick out of seeing my tight-wad brother berate McDonalds Managers for a free cup of coffee in his battered 25+year old "Free Coffee for Life" McDonald's coffee cup older than most of the managers. He would have made a good contract lawyer.