Triple charge for parking - no email response

I returned from a flight on the 5th January and proceeded to pay for my parking with my credit card. The transaction did not go through and it said \transaction cancelled\". I tried again, and the same thing happened. I called an assistant, whom said that I could use a second slot to insert my credit card. She assured me that my previous transactions were null. However, I was triple charged on my credit card. I emailed via the airport website, giving all the details but have had no response. My bank cannot reverse the charges. There is no phone number on the website. "