Marriage cert requested now

Today I started ringing at 10:00 on both numbers i.e. 062 - 32500
Lo-call 1890 252 854 but couldn't get through until 10:37. I was then put into the queue as 'all operators were busy'. Call was picked up at 11:15 by a lady who told me that they are still waiting for Gardai clearance and that there was a backlog but files have started to come through since Dec. When I probed her for why is it that the backlog is happening for some people only and how come other people who applied later are recieving their approvals, she said that the Gardai does not work in chronological order as they do. Then she told me that they are also waiting for further documentation from me. When I asked what documentation she said marriage certificate and that a letter was sent to me regarding this yesterday. I told her why was that not requested 2 years ago when I informed them in writing that I got married she said she doesn't know as files move hands and she is not the person dealing with my application. I then requested her to give me the name of the person who is dealing with my application, she replied she cannot give details over the phone but advised to read the letter that has been sent and reply to the person who signed the letter.

Now I reckon I'll have do do an affidavit for the marriage cert as well??

Also, my child is Irish and I informed them about it when we got the passport. Shall I also send copies of it.

I just want to make sure that I cover all the angles as it seems to me that they are plaing delaying tactics.