$4000 Salary rejected

I just want to share. I have been working in Singapore close to 2.5 years now as a Business Operations Manager for a Wholesale/Retail Business earning about $3k a month doing mostly sales and operations related work.

I applied to work for one of the biggest Insurance Company here as a Financial Service Consultant (Insurance Agent).  They applied for $2,400 salary (S-Pass) since I will be earning commission I am ok. But this was rejected by MOM last October 2014. 3 Months later they applied for a $4,000 salary (E-Pass) but this was rejected too.  In the MOM self assessment tool I am still qualified.  Of course there is no guarantee but I am just perplexed what could be the possible reason why I am not not being approved.

I have about 6-7 year work experience for MNC's and Corporations mostly in finance and customer service related jobs. In Singapore it is sales and operations related tasks for more than 2 yrs for the same company since.  I have already been renewed and was approved by my current company last September 2014.   I am already 30 years of age. No family.