Yes, it was an AC call centre agent. She specifically asked basic, standard, flex, etc. and I said standard. The price quoted was as expected for Standard based on AC.com (which wouldn't let me book the actual ticket or I would have saved a lot of hassle).

I checked the confirmation a few hours later. They used the 24-hour cancellation policy to cancel and rebook, but inventory had changed and they weren't able to re-book me on the original itinerary, which included an LX flight, without booking a higher fare class that increased the price by almost 100%. I guess if it was an AC inventory issue they could have opened it up to fix their mistake but since it was LX's inventory that disappeared there was no way to fix it. So I accepted a different itinerary on all-AC that was similar in price, but gets me home at 10pm instead of 3pm.

Still better than turning up at the airport, or in 2 weeks trying to make a change, only to find I had Basic.