Downsizing, but builder promises are a joke

Okay I'll be honest — moving from a big house to a flat is proving tougher than I thought. Humne Supertech Aadri mein flat liya tha, socha tha kids have moved out, ab bas easy life chahiye. But power backup ka issue samajh nahi aa raha. Brochure mein full backup likha tha, par yahan sirf common areas ka hai. Fridge, AC chalaana toh bhool hi jao. Aur elevators bhi baar baar atak jaate hain. Senior citizens ke liye yeh daily ka headache hai. Maintenance charge poora lete hain, but service mein itna fark kyun? Anyone else facing this? Kya karein?