culinary classics

I had purchased a uniform of 3 pcs from culinary classics...the pants were too big and I needed to exchange them. I spoke to a gentleman and he gave me a "RMA" to return for an exchange...nothing was said about any cost....when I checked my act online they had charged me $15.94 w/o my knowledge or consent. I was told it was for shipping and charges to resize. If I owe this that is fine but I should have been informed BEFORE the transaction, I was never aware ANY co could use your credit/debit card w/o your consent or the 3 digit ID "security" numbers. I spoke to one lady and asked for a manager...he was busy so I left a gentle message on his voice mail and asked him to return my call. I never heard a word. This is no way to conduct business.