I'm quite certain there will be an existing thread about this but I've managed to get lost in the search function between advice of various vintages and with Covid stuff and everything. So please redirect me as necessary:

I made a straight Avios redemption in First for a roundtrip back in June. Downgraded to CW on both legs due to change of aircraft, and have now flown the itinerary on the originally scheduled flights in the lower cabin. Having trouble determining what I'm due. I thought it was 75% of the Avios and 75% of the carrier-imposed fees and charges. Around 14 days ago I submitted a claim online, stating the situation as I've done here and requesting the 75% downgrade comp. As of today, they've refunded the difference between the F and CW avios for the journey, and nothing is showing up on my card -- which would be consistent with a simple refund of the difference since I think the cash component was the same between cabins.

1. Am I owed more? And 2., Is this something for the website, the call center, or the Twitter team?