Personal number in Sweden

Hello, I'm kaylie. I just wanna get some ideas how to appeal the court.  I have a working holiday visa which allows me to work for a year in Sweden. I applied to get personal number, so I can find a job and open a bank account  but they rejected it because of the length of my visa it's 5days short of a year. It says I need at least a year residency to apply for personal number. So I sent the appealing letter saying, I can't do anything here without personal number etc. but they rejected it again. I was planning to extend the visa but I have to wait till next march to extend 5 more days ;(
I'm planning to appeal again any ideas that I can write on the appealing letter ?

Thanks for reading

Kay😊