Wax vac Fraud in ordering item. Was told on Internet that to buy one and get one free and just pay separate shipping and handling which I did. When I contacted them for the status. Internet

I purchased wax vac via the Internet and was told it was $10.00. But the promotion on the Internet says buy one get one free just pay senate shipping and handling. I did as was directed total of my payment was $23.98. I logged in to see the status of my item but only saw that 1 item was shipped. I contacted was vac via e-mail and they told me that I can only get one item and I was told that if I Ryder again, that I hey will double the item. But I just ordered the previous day and the Internet says buy one and get one free. They refused to entertain my request/explanation. So I became anger and found out that this might be really fraud going on here. Please assist