I wouldn't recommend a fee for service provider to get any refund. 25% is gouging but more importantly what can they do to compel the airline that isn't their legal requirement? You can do whatever any service provider can do for free.
My opinion is you had a crappy situation but doubt you can get any more compensation that what was offered.
Compensation in your case is twofold. Legal requirement and goodwill. Goodwill will depend on you status if any with the airline. Legal it appears you are entitled to no specific compensation.
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