Since you were originally booked onto AI and they 'involuntarily' bumped you off to another carrier, logically, you should earn the same miles / segments as AI- no more, no less.
You probably got connected to a clueless agent. Contact the AI-FR team once again.
Try the chat option on the AI homepage. It's only for FFP issues and is usually 24x7.
This should help:
http://www.flyertalk.com/forum/24494347-post44.html