New City Phase 2 - Authenticity and Advice

Hi.

I have 5 Marla file in New City Phase 2. I bought the file in 2016 start… Some 5 lac was supposed to be paid at possession but the developer sent a letter in 2018 to pay all so they can give possession by end of 2018. ANyhow till date they are giving new time every day. Latest they have given is July.

Can you please tell me authenticity of this project? And what should I do?