I find it difficult to see how the equivalent of roughly 400 euros can represent 75% of the Stockholm-Dubai segment of an itinerary in First when the entire trip cost the equivalent of around 4,600 euros. (I am assuming a return/roundtrip booking.)

Even if the trip was from Stockholm to eastern Australia, with the onward mileage from Dubai roughly twice that of Stockholm-Dubai, a back-of-envelope calculation gives a refund of around 575 euro (4,600 divided by six, multiplied by 75%). If the final destination was closer to DXB than this, the pro rata refund should be even greater.

Do we know where the poster was going after leaving DXB? (Apologies if this information can be found elsewhere in this thread.)