Earthlink Internet Service Provider Earthlink.net Claimed Free Service and Then Charged For It (also I Doubt that the Product even Works?) Internet

In an internet chat exchange, Earthlink told me that their "PC Fine Tune" software was free, and asked if I wanted it, so I said yes.  Then a month later, I got charged for it.  They neglected to tell me that it was "free" for the first month only then I called them, and they refused to give me a refund.  I never ever downloaded the software, and I have mac anyway.  Also, I am a computer scientist, and I doubt that the "PC Fine Tune" does anything real "tuning" over each month as for what they are charging for it.  I hope somebody can look into the software itself too.