Experian Charged me for a FREE CREDIT REPORT, Internet

I went to Experian.com for the free credit report and was asked to put in my credit card number but wouldnt be charged. It said it was a seven day free trial and to cancel before it was up for it to be free. I got my report, then five minutes later I canceled it.

The next day I was charged $1.00 on one transaction and $29.95 on another. I called them and they told me that it was because I chose to get all three reports. It said nothing about being charged more for all three let alone one. I dont understand why they would false advertise like that. what do I do??