I've faced this many times and I can only suggest you to wait for a 2-3 more days to see if he replies. In my case, I waited for a week and the person still did not reply as he had his own reasons but he was offline but in your case the use is active and he missing out on your PMs seems odd. Is the person trusted? I mean based on his trust ratings? If so, then you should wait till he responds.
So what do you say should i keep my work on or i should stop working for him ? Neutral trust Jr.Member but he is running an forum which makes him trust able there are many registered users and the people invest money with him and have not read a single bad comment against him on his forum .
Maybe he didn't say your PMs but maybe he ignores the PMs, if you can contact him by email or by the forum you are saying then try it, otherwise i think that you have waited enough for 2 days and it's time to make a scam accusation thread, by this he will get notified (and probably tagged with negative feedback which is not good for him) and hope he will pm you back.
How is this possible 5 PM's he did not see anyone ? i guess he is ignoring or he is busy i don't know whats going on . Well i am going to contact him on his forum . Lets hope for the best.