Raj Nagar Extension mein Gulshan Homz ki delays: What now?

My project was supposed to be delivered by last year, but ab tak construction mein hi atke hain. Honestly, I'm in real estate myself, but buying for my own family in Ghaziabad has been such a headache. Booked a 3BHK in Raj Nagar Extension with Gulshan Homz, thinking pre-launch discount acha milega. They promised possession in 3 years, construction-linked plan tha. Ab 4 saal ho gaye, aur abhi bhi finishing work chal raha hai. EMI on time ja rahi hai, but possession ka kuch pata nahi. Builders ka pre-launch marketing kitna misleading hota hai, I know what they don't tell you. Super area vs carpet area games aur hidden charges toh alag. Matlab, should I just keep paying EMI ya builder ko RERA mein push karun? Has anyone dealt with this kind of delay with Gulshan Homz in Crossings Republik? Kya legal option milta hai humein?