After 3 months of waiting i finally received my 75% reimbursement for an involuntary downgrade from WTP to economy due to rebooking on different airline ( From BA to QR) Now the issue is that i can't be sure if the amount is right. Amount returned per pax is £220. If i try to get pricing for specific date (23/3) one leg economy vs premium economy, not from PKX but PVG that BA is still operating and i get the following.
Economy: £290 and WTP: £634.

Shouldn't i get per passenger more than £400?

Here is the fare breakdown per person of the original ticket. GBP 3014.78 for both.