Instaflex

I OK'ed this company to charge my credit card $4.98 for shipping and my card was charged $74.98 for the product. I am willing to send the unopened bottle back for credit card refund. This is a terrible business practice.
Thank you for any help in the matter, Also they sent after 2 weeks another bottle of this Instaflex and charged another $ 36.75 and this drug does not affect me and changes in my illness