You have written your problem about how your application for the extension of sabbatical has been turned down. Nevertheless, what is important here to understand is to know what did you write in your application. Was your argument persuasive? Why your authorities did not consider extension even for "few days"? Did you submit application well in advance?
At this stage, you may ask for the personal interview of the authority who declined the permission. Meatiness of your argument will decide the outcome of the meeting.
All the best!
From India, Bangalore
From United States, San Ramon
From India, Mumbai