Defend My Device I was checking my bank account and I have a 40.00 dollar charge from defend my device I called the number on the check and they cannot tell me how they got my info they said they will try to refund me my money Internet

 On December 3rd 2015 I had a check withdraw in the amount of 40.00 to defend my device. I have never heard of this company I have no idea how they got my info. I called the number on the check and they could not tell me how they got my info, they said it was thur the Internet and I should of checked a box at the bottom of the page saying I didn't want there service. I asked what site I was in and they could not tell me. I have no idea how I got this charge or what website I was on.