It is unnecessary and it causes confusion to create multiple posts on a single topic. As for demanding a response to your posts, in my view that is not very courteous. If a person has information that might be useful to you, and they have the time and inclination to reply to your post, they will. If they don't have useful info, or don't have the time or inclination, they won't. But it's unreasonable to participate on these message boards with the expectation that somebody will be guaranteed to solve your problem.
You might also take advantage of the Search functions available on this site. Many times, the answer you seek is already available in somebody else's post. -- J.W.