Let's Make Home Buildtech ka possession late kyu hai?

Sector 89 mein Let's Make Home Buildtech mein flat liya tha. Possession date toh March 2024 tha, abhi tak kuch nahi hua. They keep saying 'sir, ho jaega, ho jaega'. EMI already shuru ho gaya hai, rent bhi dena pad raha hai. Anyone else facing similar delays with this builder? Is it worth filing a RERA complaint? What's the best way to deal with these builder promises? First-hand experience chahiye, please share. Frankly, I'm frustrated.