H1B RFE No Client letter

Hi, I got RFE for Employee-Employer relationship and client letter. I’m ready with all the PO, SOW, MSA, experience, offer letter etc. to submit. But Only Client letter is not possible to get. What is the alternate option if Client letter is not there?

SOW which is submitted at the time of petition is expired by July15 and location is A. So submitting the new SOW for the same client which is valid for June16. But the location is B. Immigration teams said since they raised the petition with location A, they will use the same location now, even the location differs in the new SOW. Will it be a problem?

And I have provided the client contact details, but I will not work for him. Will USCIS do call him?
Can you please respond asap.