<prompt> Human: Lets say that I sign up for a free trial on a shady auto-renewing music website.Lets say that I dont trust myself to cancel it before it auto renews for the next year.Can I tell my credit card company to automatically reject all charges from that company? The other option would be to do a chargeback afterwards, but thats not guaranteed to work.  <response>: You could use a card that has virtual card numbers, then just remove the number when youre done using it. Citi offers this. 