Hi, thank you for contacting JustAnswer.com. My name is Russell. I will do my best to provide the right answer to your question.
I advise you to contact the Customer Support department of whatever the website, or company, that you ordered the bottle from.
What you appear to have been charged for is a minimum quanitity of 2) ea and 15 % tax (or some surcharge with tax, together amounting to 15 %.)
Cancelling the order promptly with that website or company, will be most likely to straighten out the problem. They may have a minimum order quantity policy, perhaps, but you didn't order them to charge you twice plus 15 %.
(If you need guidance as to what/where their Orders dept. or Customer Service contact info is, just let me know what company or website it was that the order was made to.)