It actually depends on the new lawyer whether he wishes to accept your case without NOC. In fact, this NOC thing is not a legal requirement, but their personal requirement.
I think you will not have much difficulty finding a new lawyer even without NOC. Just go ahead and sign up a new one and make him stand for you.
Generally you should avoid complaining agianst your previous lawyer, but if the matter gets really serious one and he is at genuine fault then you can complain against him at the Bar Council!