Forced to give Credit Card Details over Phone!

I booked tickets for the weekend, online. I accidently booked for the saturday, instead of the sunday. So I phoned Ster-Kinekor and was informed that the only thing they can do is cancel my online booking and rebook me. But I would lose my vitality/ster-kindekor discount. So I thought, fair enough. I had made an error.<br> She then informed me she needs my credit card number to refund me. I gave it to her. <br> She then asked me for my FULL details - the expiry date of the card and the digits on the back of the card! She said it was to re-book my ticket. Why can they just change the date on the system? I mean I paid for two tickets, why can't they just change the date? Do I really have to go through a security risk and possible credit card *****, just to change a date of a movie?<br> It's not like we are living in the dark ages - I am sure we have the technology to create better cinema systems.<br> Don't make online booking/self service systems for clients and then demand full credit card details for minor errors.