I was robbed

[Blabla3]

Hi. Does anyone else has this experience with shopify? I was charged $460!!! on my credit card for something I never signed for! I installed the app, had it for like a day (not exploring it cause it seemed rather too complicated and I have nothing to sell anyways), and must have confirmed somewhere that these leeches will steal whatever they want from me. I don't understand how else they took my money. Anyone else has the experience? I'm thinking to go to the police. 

[Blabla3]

I didn't apply for anything, nor was I noticed about any upcoming payment.