Good evening every one,please I want to ask about Vodafone contract,I make a contract about Vodafone this year and it was 2 years contract,it was a Wi-Fi contract Giga cube and i made it but it was strash,it was not working and i went to complain about it and the shop man told me to show him my ausweis of which I did and he said I was not allowed to make Vodafone contract because my ausweis is Duldung,so he said he cancel it already and ask me to return the Giga cube of which I did,but the problem is that Vodafone send me a letter that I'm having an outstanding bill of which the contract has already be cancel,I made the contract May this year 2018 and I return the Giga cube the other month because they said I'm not allow to use the network because of my ausweis,and now they send me a letter that if I don't pay the money they will refer me to Inkaso,what can I do please?