Extending stay in Paris

I am from Singapore and came here on a social visit pass 2 months ago, as a Singaporean I can stay in France for up to 90 days without any visa. I came here to look for business opportunity and found plenty of it. Now I am facing a problem of extending my stay as I went to the Singapore Embassy was told that I need to go back to Singapore to stay for 6 months before I can come back again. Anyone can advise on this issue? Please help!!

Thanks
Jeffrey