I paid double, how do I make sure I get my money back?

I paid double, how do I make sure I get my money back?

Oops, that’s obviously very annoying. Do not take any steps yourself yet, such as reversing the amount. This will avoid any ambiguity regarding the double payment. Please contact our customer service immediately at +31 (0)36 52 10 130. Then we will solve it for you as soon as possible.