H1b 221g form adking client letter and contract

During my visa interview VO asked me to submit the client letter and client contract.I didn’t have client letter. And I showed the contract I have collected during my RFE.the end date in it isJan 2015.so he refused it and issued a 221g blue form.and checked client letter and updated contract.my client won’t give client letter.So how I proceed? The client contact only help me?
Please advice

Many sponsors hesitate in providing client letter because your job site and principal payor might change. Ask them for some evidence that describes the work you will be doing and that the client has been doing this type of project work for some time.
Best wishes

Dr. Sandeep Shankar, Colorado Heights University, www.chu.edu, sshankarATchu.edu

Thankyou sandeep.

Now another client of my company is ready to apply petition amendment.so
1 Is it possible to change the client at this time ?
2.If so please let me know the process and how long it may take as my petition will expire on this Sep 2015