I have a DONE4 ex-JNB (TC2) booked for departure this May. Mindpearl have advised that the rules changed on 1 November 2008 such that there is a penalty for cancellation, regardless of the region of departure. (Previously, TC2 and TC3 incurred no penalty.)

This DONE4 was ticketed on 4 November 2008 and I was careful to download and save a copy of the rules as they were then. According to that document, as at 4 November, the rules hadn't been updated and there was no penalty for cancellation in TC2.

Whilst the current techincal rule sheet lists the 5% cancellation penalty for business/first class itineraries in TC2, I can't find anything on the sheet that indicates when it was updated.

What are options? How do I prove to AA that when I booked on 4 November the rules hadn't been updated? (No intention of cancelling at the moment, but I'd like to be prepared in case I do.)