You need to uninstall skype (even if it isn't fully installed and configured, it thinks it wants to be) before it'll stop attempting to pull down the dependencies. apt-get purge skype MIGHT work, but if not, while it's a long way around, this will in the end accomplish what you want:
just deal with the fact that it's going to download the packages and install them
apt-get purge skype
apt-get autoremove --purge
This will then purge all files for skype, purge all packages that were pulled down for skype, and purge the downloaded .debs for any software that is no longer installed on your system.