Hi dear, I'm absolutely sure that
@vivekskumar8544 would have gotten 2 or more certificate points based on his WES ECA report as it clearly said diploma 2 years and bachelor 4 years.
When a candidate is filling their EE profile, they should lists their qualification separately as well as their ECA report detail and EE system will calculate the points accordingly.
You can try to contact WES and ask about your enquiry. They may allow you to put a new file for re-assessment of your previously completed ECA report. There is no harm in trying.
Good luck.