I changed things, and paid, but my bill is confused. Why?

Hi, about 2 months ago I changed my phone and plan so that it is all under my name. It was under my dad's name before, but I was still paying all the bills myself through online banking. Last month I paid my bill the way I had always done before, but my bill this months says that I did not pay last month's bill. Why is this? Did I send the money to the wrong place?
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