Find a similar flight on capital one travel that is available to buy from them, then call them you should be able to get it for the same price as long as it's not more than $1000 more than the one you booked. The way I did it was I booked it (free 24hr cancelation) then called them to refund the difference between what I originally paid to hold, and the new flight. Bust be similar itinerary. I was able to get free business class this way.
From the T&C
Availability. Freezing a price guarantees the price for a specified ticket (up to a maximum refund cap, if applicable), but does NOT guarantee availability of the frozen flight itinerary at the time of booking the ticket. In the case that a frozen itinerary is canceled, becomes unavailable, or no longer has available seats remaining, you will be notified upon attempting to exercise the frozen itinerary. If available, you will be offered similar flights by Capital One Travel as alternatives to the canceled or unavailable itinerary. You may exercise your frozen price for a suggested similar flight, subject to the maximum service cap and to availability. If you do not accept that offer, or Capital One Travel does not offer an alternative similar flight, Capital One Travel will refund the service fee paid to freeze the original flight price. Upon purchase, you acknowledge and agree that this shall be your sole and exclusive remedy for the unavailability of the selected flight.
Upon freezing a price for multiple tickets together, the multiple frozen prices may not be exercised individually and must be exercised together. If a flight does not have sufficient seats available for the frozen prices to be exercised together, you will be offered the same alternatives as detailed in Section 3 for similar flights and a refund.