Cancel Ticket and Re-Purchase at Lower Price

I recently grabbed a one way reward in UC from LHR-JNB, and then purchased a Z return, intending to use the other leg later in the year. At the time of purchase I inteneded to purchase two seats but the agent misunderstood and I just bought one. In researching prices the same ticket is now about $1100 cheaper.

Could I cancel my cancel, get a refund, pay a penalty, then purchase two Z at the prevailing price.

Is there a rule against this?

Lastly, I've been through the VS website, but haven't found in the various terms, what any cancellation fee might be.

I can call the airline, but dont want to do that without some input from the guru's on whether what I'm doing is possible.

Thanks

Z is non-refundable so that answers my question.

[Darren Wheeler]

Sorry, a Z is a non-refundable fare - http://www.v-flyer.com/codes.asp

All you would get back is the taxes, fees and surcharges.

The moral is, never look once you have booked [:)]

Good news is thanks to the agent's mistake, I save $1100 on DW's ticket. And thanks to the web site changes, it's now much easier to get reward flights figured out.