Money taken from my account

We went to LimeWire website on Sunday 13 may to download music. We clicked to pay 1 pound 66 pence. We paid this amount using my visa debit card. I checked my account later and saw that, to my surprise, they charged me 34 pounds and 1 pence. Moreover, they charged me again the very next day with 34 pounds and 76 pence. I did not give my permission for these payments, and I am talking to my bank to get my money back.