First flat in Delhi, but some post-possession issues popping up.

My first flat in Gujranwala Apartment, North Delhi. Possession March mein mili, abhi 2-3 mahine hi hue hain. Construction quality ko leke thoda worried hoon. Already kuch minor cracks dikh rahe hain, aur bathrooms mein seepage ka issue start ho gaya hai. Builder ko call kiya toh response slow hai. Aur post-possession maintenance charges bhi kaafi high lag rahe hain, almost ₹4500 for a 2BHK. RWA formation ka bhi kuch clear nahi hai, builder seems to still control things. Kya yeh normal hai? Any residents here facing similar issues?