Still I paid

I've changed ISP long ago, but according to payment announcement service on the net, I still paid fee for old ISP on even November. Read the descriptions there, oh it was to pay for August. Just my misunderstandings.
Why can I get credit card? I got it when I was student, over twenty five years ago. Before getting that, I usually send money via Post Office to buy overseas books.
When I sent dollars by that method, US dallars was 250 to 200 yens, it was early '70s. The bookstore at Tokyo did sell foreign books more than 300yens/dollar rate. Even a highschool boy can find the cheaper way to get them.