Actually your previous companys offer letters does not transform into experience letters. Correct. I think thats why they did ask you for exp letters. Regarding,
I told you that I also submitted promotion letters with dates, designation and salary structure.
"2) Submit ability to pay from 2002 to present. I only submitted financial statements for 2003 and 2004. They asked it for 2002 also."
-- For this, you also needed to submit your most latest paystubs along with your company's financial statements like Bank statements, Tax filing docs etc. Did you submitted them when you replied to RFE?
My PD was Dec 22nd. That is why I didn't submit financial statements for 2002. Atleast my attorney should have checked it before submitting all documents for I140. Finally I had to submit audited financial statements for 2002 and 2005 also. My company has more than 100 employees. I also submitted a letter from company CFO. As I told you my attorney should have taken care of all these missing/incomplete documents in first place.