Please HELP!! renewal of permesso!

Hi,
I'm currently in the process of renewing my permesso and am faced with some problems.
I completed my masters in design course at the end of december 2012 and have decided to stay for another year to learn the language and check out my options, so i enrolled in a one year language course. I went to the questura to register for the renewal and they didn't accept it as my enrollment letter did not have the stamp from the italian embassy in my country. I have contacted the embassy regarding this and it is still an ongoing discussion till my next appointment on 08/02/2013.

However, i read on a US website that says (Photocopy of the statement certifying the study programme certified by the Italian Embassy/Consulate which issued the entry visa (presentation letter written by the School in order to support your visa application with the stamp of the Italian Consulate/Embassy where the visa was issued) OR certificate prepared by the School in case the Italian Consulate/Embassy has not put the stamp on the letter.) What does "certificate prepared by the school" refer to? Is that an option to getting my documents stamped?

Please help as I'm really desperate and running out of time!!
thanks!