Are you calling your travel agent or Celebrity direct ? I’m sure the UK now allows one price match in the booking T&C’s …. We booked onboard last few times for future cruises and were told we could get best price match if it changed ?
Also for this years cruise we booked a sky suite and only one was available when we booked and better positioned became available a few months ago (corner aft sky suite) I emailed our TA in UK and she said no problem, changed booking with Celebrity and no change of price or charges (and the SS is now over £3K more than we paid when we booked !!