H1B in Admin processing under 221(g)


I went for my H1B stamping at Kolkata on 2 dec 2013 where VO asked me for client letter under 221(g) even when I am physically going to work at my employer’s location. For the same reason, client is not willing to provide any client letter as the project is being executed at employer’s location.
What can i do in this situation to get my visa stamp? In case my employer wants to change the client what are the actions required to be done at visa office in India. My H1B is approved from USCIS California service center.

Thanking you in advance for your great help on this.