Anyone had experience with CX flight cancelled and automatically rebooked into flights of bad/undesirable timing? This is award booking using AS miles.

This happened to our flights in Dec. Of course, no award availability is there for the flights (same day) that we want. Called CX and asked to open up award availability and rebooked, but given NO by two different agents. Haven't called AS yet but guess that AS couldn't do anything.

Any suggestions?