2 days ago I saw an advertisement on Facebook about a free prepaid card. I went there and ordered it. Today I got an email from Vaibuy saying that my card is on its way and that I must pay 90€ for fees. They also said that if I change my mind within 14 days I can send them an email and pay absolutely nothing. So did I but then I went outside and I saw that the ViaBuy card had arrived. I am scared right now, will I need to pay anything? I live in Munich and I don't know the laws. Please help me.