7/21/15 charge on my credit card in the amount of 33.94 twice.

I ordered this product last month, received it, and paid for it on my credit card 6-23-15. There is a new charge on my credit card dated 7-21-15 in the amount of 33.94 two times.  I never ordered more than once, and that had been paid for.  I notified my Mastercard of this error. Please delete $67.88 from my bill as I do not intend to pay for this mistake.