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Unfortunately EasyJet does not refund unused baggage allowance as per their Terms and Conditions (emphasis mine):
Add hold luggage, sports equipment or increase your weight allowance
You can add new hold luggage or sports equipment, or increase your weight allowance. Just log into Manage Bookings or our mobile App and select the 'Add hold luggage' option. Youβll need the email address and password used to make the original booking.
Weβre unable to refund luggage allowance youβve already bought.