Korean university student can’t get accepted??

I m not a registered student yet and when I applied for ACCA on May 2th, I hoped I would be a student . They rejected my letter of admission, enrolment, completion and transcripts from university. It took them 10 days each time they denied me registration. Now they are saying in the documentation I provided there must be a ststement which says I m studying for a Bachelor’ s degree or Affiliate although my institution does not confirm that with documentation. All they can do is to issue abovementioned documents which confirm everything but Bachelor or Affiliate. Is that such a big deal. Bc ACCA clearly knows by now I am an undergraduate student. Why would they even deny my documents??
I called ACCA several times and they keep repeating that I should provide what they say.
I hope somebody has run into such bureaucratic issue with ACCA before and can help me with that.
Thanks in advance so much