I'm curious about this whole thing. Skype isn't a wifi provider, so far as I know it's a voice/video service owned by Microsoft that either allows you to connect with other subscribers for free or offers other additional services for a fee once you are connected to the 'net". Tengo is an internet provider that's pretty common in the SW US that allows you to connect to Skype or anyone/place else you might want to go on the internet.
So far as I know, Skype can't bill you for internet service since they don't provide it. If Skype has an e-mail service, I haven't found it and if I did, why would I use it, especially if there was extra cost involved.
Is this a new scam or just a misunderstanding?