Northstar Nutritionals They shipped items without my approval, charged my credit card and wanted me to pay the freight back on their mistake Frederick Maryland

I ordered some Smoothenal oil for pain from Northstar Nurtritionals, they shipped as promised, but when I was checking out there was all these popup adds for their other products coming up, I reected them all and even wrote customer service a note that stated I did not want any of their other products and when I received the confirmation I only was charged and shipped my 3 bottles of Smoothenal which I ordered, however there was a second box that came at the same time with no packing slip or confirmation, then about a month later I received a bill on my Discover card for the extra shipment $41.97.  this is not fair and could be a scam, I called them and they said to return it at my cost that I ordered it, they were not pleasent to talk to at all.  Unfortunately I threw it out because I did not want it and did not think they would bill me for it so I could not return it.