Gurgaon RERA: Just a formality for builder delays?

Golf Course Extension Road projects... honestly, I'm regretting it. Kids have moved out, so wanted a manageable 3BHK, ₹2.5 Cr range. Booked with AVL Infrastructure, possession was due last year. Abhi tak OC nahi mila, builder bas dates de raha hai. My resale money is stuck, EMI jaa rahi hai, it's a mess. RERA complaint file ki, par lagta hai bas paper pe hai. Has anyone actually got relief for builder delays and OC issues? Kya karein?