Peak Life Somna Pure SomnaPure charges you 4.99 for shipping for a free sample, then charges your credit card again, Internet

SomnaPure, marketed by Peak Life, offers a 30 day supply of their product and you pay the shipping charges of $4.99.  Then 30 days later I find a charge of $78.94 on my credit card for another 30 day supply, which, by the way, I have not received.  I called their number and they tried to tell me that I authorized the additional shipments by giving them my credit card number.  I did not authorize any additional shipments, only the free sample.  They gave me the runaround, and a week later I still have not received anything from them, even after e-mailing them several times and speaking with representatives of the company.  This is a scam, and I would like my money back.