What should I do about my birth certificate request before my immigration interview in Thailand?

So I was having a couple of issues in regards to identity and the requested document order time. They requested a birth certificate and it was going to take up to 4 weeks for me to get one.

I sent in a word file explaining my situation under the requested birth certificate and asked if they can extend my application process an extra few weeks and instead they have told me to come in for an interview.

If I go for the interview and I don’t have this, is it going to be an issue? Surely they wouldn’t request an interview without some other option of proof of identity?