Upvote:9
Being a victim of crime, and especially having your passport stolen, is a circumstance in which you should contact your embassy's after-hours emergency contact phone number.
For Spain, that number is +34 6 1975 2305.
You will need to either apply for a duplicate passport, or an emergency certificate to return directly to India.
You should expect either process to take close to a full day; it is possible you might not make it to your flight on Monday. You should mention when you call the embassy that you have a flight on Monday, to see if they can help you.