"I have carefully considered your application. However, you do not qualify for a visa for the following reasons.
I have assessed your application against the criteria and points table for HSMP. My calculations, based on the documents you have submitted with your application, show that you are short of the minimum required points total by twenty points. Consequently I am not satisfied that false representations were not made and that all material facts were disclosed for the purpose of obtaining your immigration employment document."
This is the complet reason given by them.
I had applied from Bangalore to Chennai office through VFS bangalore.
They did not return my HSMP Approval letter back to me

Can I re-apply? How can I re-apply if they have taken my HSMP letter?
What else can be done?
I had provided all the documents as in HSMP application, except my birth certificate. Had claimed these points:
Age - 20
Degree - 30
Salary - 25