storage problem, have deleted prezis and videos...

Hi,

I don't have much time and I hope this problem will be solved very very soon... 

prezi says to me, that I don't have any storage left for uploading more videos.
So I deleted old prezis and some videos in this particular prezi
http://prezi.com/vipxjrvzp5dj/music-earth-indonesien/
but I still can't upload anything.

I have an Edu Enjoy account, so I think I should have 500 MB...

Thanks for helping me, because I have to present my prezi in one hour... :(