Housing Nightmare: Tenant's Dilemma

Mr. Kumar rented a 2BHK flat in Delhi from Mr. Saxena for ₹50,000 per month, paid in advance for 6 months. However, after occupying the flat, he found it had several defects - leakage, dampness, and broken furniture. Mr. Kumar demanded compensation and repairs from Mr. Saxena, who refused. What legal remedy can Mr. Kumar apply to seek damages and rectification of defects?

(Note: Assume the scenario is not covered under the RERA Act, 2016)