I think you might be referencing my response out of context if indeed I've responded to a situation such as yours before - I've responded to so many posts, I can't keep track. However it would help if you're about to say who it was or quote the post in question.
I think part of the mistake also is relying on someone else to follow up on such an issue with KCC on your behalf. You have more standing with KCC than your host, you have access to the Internet, you have a good grasp of English, so I don't understand why you didn't contact KCC yourself. Did your host forward the correspondence with KCC to you and did you take that along to your interview and presented it to the CO when the issue was raised? The reason I asked is because if you mentioned it in the forum, we would have told you to contact KCC directly and if you came back to tell us KCC told you to go ahead and fill the DS form as it should be, we would have reminded you to take that correspondence along to your interview. This is not a situation of one calling KCC, you want to have record of all communication in a situation such as this. And like Simon noted above, contacting KCC would have enabled them to re-run the background check with your first name as it should be prior to the interview.