Yes Fegusson College does offer a BA course in Economics. You can verify the same at this link: https://www.fergusson.edu/article/AcademicProgrammeFlyers.html
Moreover K.J Somaiya College of Arts and Commerce, Mumbai  also offers a course on B.A.- Degree in Economics (Three year- Semester system). You can verify the same at this link: https://kjsac.somaiya.edu/en/programme/kjsac-ba/economics
So both the colleges offer the required degree. Choose wisely!