I need an advice, I have a valid (short stay) Italian Tourism Schengen Visa, type C. I have earlier applied for a PhD in Spain in my country. Then I got an invite to participate in an academic conference in Italy, therefore I had to travel to Italy, immediately after the conference, the University in Spain sends me an email for an interview (which was last week) for the PhD programme and I have to stay longer than the days of my schengen visa (which expires on the 17th of October) to process my PhD in Spain, because there is a phase (from October 29 - November 6) of Self-Registration. I do not want to risk missing my admission for the Phd programme since I am in Spain. If I go back to my country today or tomorrow, there is no way I will be able to come back before the 29th of October.
What do I do since I came to Spain with an Italian Tourism Schengen Visa, type C and it will soon expire?