221g blue slip VO asking for client letter.

I went for H1b Stamping on Aug 10th 2018, Below are the questions asked by VO.

Who is your petitioner? answered

Who is your client? Answered

What is the location? Answered

Do you have client letter? Answered

I told I got Statement of work with me, and then I gave and he had a look and asked does it have your name mentioned in it, I told no then he gave it back.

What is your salary? Answered

After this he handover 221G letter mentioning you need to email the client letter stating your name and they are expecting to work with you. Also he mentioned you don’t need to appear for interview again.

He then returned the passport saying after reviewing your client letter we will send a notification to drop your passports on the drop box.

But my client doesn’t provide client letters for contractors, Client is ready to help on verification etc. I am into EC model. Can anyone please suggest what is the alternative we can provide. Also what are all the chances for VO to issue my visa.Many Thanks in advance!!!