They have not really. You ticked you didn’t want a free upgrade from P & O for all the reasons you started. This is different this is an opportunity to chose and bid on cabin /grade / position that you may have considered but not thought it worth the extra money. A possible bid may get you a better cabin at a price you are more comfortable with. If you don’t bid on anything, nothing changes. No upgrade. Can’t see P & O have ignored your request.