My iPhone won't let me buy apps?

Every time I try to purchase an app on my iPhone, it tells me that I need to answer some verification questions. I try answering those questions, but it turned out that those questions were probably never answered when the account was being made. This means that I have $20.00 in my iTunes account and I can't spend any of it. What do I do?

You have to call Apple care at 1 800 my Apple and have them reset the questions for you (=

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