Greater Noida Registry and post-possession issues?

Two years ago I thought buying in Greater Noida would be straightforward after kids moved out. Now, after getting possession for Unnati Fortune World, the registry process is quite something. I've already made two visits, and there's talk of unofficial demands. Is this normal? Also, some minor fixes post-handover, like a leaky faucet, the builder isn't addressing. Did others face such issues in the first month and how did you resolve them?