Just as I'm about to go and get my degree, the university called me saying I'm missing a course while two months ago they gave me the green light that I was done!!! Not only I'm upset, but I'm also confused as to what am I gonna put on my resume now that I've 119/120 courses

This is a wired situation. The university has agreed to at least give me a letter stating I am done except one course. I'm also on the Dean's List and have two letters in that regard. What should I put on my resume. I certianly don't want to write a story on my resume as to what happened, what to do?