DuckDuckGo – Was told this site was free for 7 days and can d/c if not interested with no charges

I was trying this site on a trial basis had 7 days to try it free. So I decided that I didn't want to continue wit site so I canceled my subscription on the 4th day. Thinking that everything was taken care of until I looked at my bank statement and I see where I was charged 10.59 for this site. So I would like to have my account refunded the 10.59. Thank you