1) sir for new property there is no question of Society NOC.
2) You must be certain about the fact so that expert will give you proper guidance.
3) In ur case if we consider that society is there then if it not issuing NOC then it must be clear that there were certain due pending on the flat which you have purchased.
4) U require loan in order to complete ur transaction there for give simple application to the society and requesting them to issue NOC. In that application u must mentioned ur purpose for this NOC.
5) The society will state the reason why it was not issuing NOC. Then told to seller or builder to comply it. After that society will definately issue NOC.