Brina Laval

Hello there, today i bought 5 different items on the marketplace and got all of them. But i remembered that I sold too many Linden. A look in my account history told me that I payed twice for two products. (7 Marketplaceorders and 2 with the same count) In the marketplace history are just 5 products as it should be. How can I get the money back? Brina.