From 2BHK to 3BHK: My frustration with RERA projects

RERA Approved Projects mein bhi hidden charges ka scam chal raha hai. I'm in a 2BHK, planning a 3BHK upgrade. Builder ne brochure mein kuch aur dikhaya tha, possession ke time costs badh gaye. RERA isn't preventing this. Bahut frustrating hai, yaar. Anyone faced this near Gachibowli? Kya kiya aapne?