Bringing this forward--booked on AF Prem Econ INV-IAD through AMS and CDG. At 30 hrs, processed a paid upgrade for CDG-IAD at $450-ish apiece. Also booked an upgrade INV-AMS for $65. Received upgraded seats for both. At roughly 24h, AMS-CDG cancelled and I was autorebooked onto the AMS-IAD nonstop. Checked in at INV, flight was fine. Cooled our heels 4 hrs at the Crown Lounge. About 1 hr before flight, noticed the Y seat (KL doesn't have Prem Eco on this flight). Tried to get resolved at help-desk, but they said "only one seat available for upgrade; and no aisle seats in Eco Comfort". We ended up with window/aisle on the 330 in Y (had I noticed earlier in the lounge stay probably could have done something to be rebooked...alas...). We did get home early and were able to stand by for a better flight home, so there's that...

Where do I go for the refund of the paid upgrade ($450x2) and the downgrade from the baseline ticket(Premium Eco to Eco)? The upgrade acknowledgement does have a refund tab, but does that hinder the case for my downgrade?