We were travelling from Valencia to Athens via Istanbul, Turkey. We had a travel itinerary to visit Greece and had a valid Schengen Visa.
However the visa officer at Valencia Airport stamped an exit schengen stamp on our passport. When we reached Istanbul, we were denied entry on the onboarding flight to Athens stating that we had a single entry schengen visa and there was an exit stamp on our passport, so we cannot enter schengen country again.
Is was a mistake on the part of the visa officer. I am not sure whom I can complain to regarding this. Can someone please guide.
Thanks
A