I am from Philippines working in Dubai, I recently applied for Schengen visa going to Italy, I submitted 2 passports as one of the required documents (renewed and expired since my valid UAE residence visa is on expired passport). When I received the visa I found out they stamped the Schengen visa on my expired passport.
Will that be a problem or I need to send back my passport? I'm worried as I will be travelling on 4th of Sept 2016.