please apple fix it

every time i want to download an app something appears and it says that theres a billing problem with a previos purchase and im stuck with it for 3 months and i dont even have a credit card and i didnt purchase anythin i swear i only download free apps and now i have 43 updates and i want to download clash of clan my sister once gave me her user to download temple run 2 but shes not telling me her password so please fix it apple