Credit card details leaking at Computicket

I am concerned about credit card handling when purchasing tickets on-line via Computicket. I recently bought Ed Sheeran tickets, having to take my credit card to collect my tickets, they then went old-school rubbing my credit card off as proof...WHY having to proof my payment after they have received the money into their bank account months before the live event???, My CC were then leaked via their human intervention, strongly suspecting this, as it so easy to also just get the 3digit number at the back of your card whilst checking/verifying your purchase. My CC was then hacked and emptied out completely yesterday during the live event, a couple of ********** on-line transactions in Berlin, Germany. Co-incidental?.., i do not think so!

PLEASE BE WARNED!