That's actually not a contradiction. She says she received the bill on December 15. Most likely they stopped calling each other after that, which is why she was so relieved when she finally got to talk to him on skype. Just because he has an access to skype now, it doesn't mean he also had it last year.
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"If you keep making fun of me, I might just get pissed and not post on here anymore. Start taking me seriously. I'm a student now" Fatja