Does your account balance in the top right corner say $0 or $50? because likely the extra $50 is added to your account as credit (if the balance is $50) and you can use it for your next month's payment.
Hey, I had a similar thing happen to me. I checked my plan again and realized that I have unlimited *incoming* calls but that there is a limit to how many outgoing calls I can make. Hope that helps!
