Good Morning Arjun,
Is your purchase in the State of Florida?
Did you receive the Condo Documents and did you read them?
Did you visit the property with your Realtor? Was inspection done?
Did the appraisal reveal the square footage and that's when you found out about the difference in square footage?
These are all questions that need an answer prior to closing, you are paying per square foot, so are you paying for non existing sq. ft.?
Your Realtor if not his/her BROKER should be able to help you. I would contact the BROKER to your REALTOR.. I hope this helps.
Iris N Cortez, P.A.