Upgrading to 3BHK: Payment plan choice stuck

My current 2BHK loan in Sector 137 is ongoing, but I'm looking at a 3BHK in Sector 70A. Dharohar Realty wale construction-linked payment plan push kar rahe. Mera EMI already chal raha hai, toh down payment option mein discount milega kya? Ya CLPP hi better hai? Koi experience share karega please?