Purity Products Ripped me off two bottles and said they could send me one more as a courtesy Plainview, New York

I ordered three bottles of Multi-Greens and when the box arrived there was only one box of Multi-Greens inside.  I called and explained the situation.  I was told that as a courtesy they would send out another bottle.  I told them that was not sufficient because they shorted me TWO bottles.  They refused to make it right, so I am out $30.00 some dollars.  Am making a formal dispute with my credit card company.  Somebody at Purity did not package my order correctly and it seems somebody at UPS got lazy and didn't weight all the like-size boxes.  So I am jipped out of about $30.00 worth of vitamin supplements.  I didn't make the mistake, but they expect me to pay for it...