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I can’t change the payment method for my public mobile account. every time y try it returns an error and has not accepted any credit card I have entered 

I have redeemed the Unlimited US Minutes add-on for 15 days, but every time I try to make a phone call to a US number, I receive a recording stating that I have no minutes and need to purchase them. Why don't I have access to the unlimited 15 days of...