Why am I not upgraded to level 3?

Why am I not upgraded to level 3?

I am here around 1 1/2 years, done around 20 purchases and was in level 2 as a buyer.

However recently I started to work as a seller too. Then I was marked as level 1 seller,

With that I have completed around 26 sells, with 100% rating..
No issues so far,
3 hours response time

except the withdrawal of money , I have passed the requirement of level 2...

But as I feel, I have completed the requirements of level 3.
I contacted the custom service and they mentioned always it is upgraded automatically..

So, What I need to know is can't I go for level 3 by passing the level 2 as a buyer..