Hidden maintenance charges after possession in Sector 7X

Just got possession in March, and the maintenance charges are insane! Like Rs 4 per sqft. Builder promised it would be much lower. Anyone else facing this? I'm in Sector 7X. Tried talking to the builder's team, but they're just saying 'it's standard'. Seriously? Also, the amenities are not fully ready yet, but they are charging full maintenance. Is this normal? Should I fight this? Kya karu, yaar?