My first 3 months in Prestige City and the power backup shock

Power backup claims are completely misleading, especially for Prestige City. Just moved in last month, aur yahan full flat backup ka naam hi nahi hai. Sirf common areas ke liye milta hai. Brochure mein toh '100% power backup' likha tha, but for common areas only, they didn't specify. Ab inverter lagana padega. Anyone else got this shock in their new Bengaluru flat? What did you do?