This company does not believe in "the customer is ...

This company does not believe in "the customer is always right." I was extremely disappointed when I called to tell them that I had received the wrong size in my online order and the customer service representative responded by telling me I was wrong. I am certain of the size I ordered (they might want to indicate size on their invoices). I am able to return the product but they will not be covering the cost in shipping to or from me. This is an unacceptable customer service practice.