Dear My name is Rodrigo canto and I live in São Paulo. I am a Culinary Arts professor in Brazil. Last week a student gift me with a birkenstock. She brought the shoes from Berlin. Unhappily she brought a big number in and now the shoes are very big on my foot. I'd like to change. She gave me the invoice. How should I preced now?. Contact: rodrigoscanto@hotmail.com Regards, Rodrigo Canto