No, they said they were going to send a MAC code.
Jake, why cant you just stop the CC payment (as opposed to stopping the DD). If you write and email to them informing them that you do not wish them to take any further payments, then they will have to refund you should they continue to do so. I would also contact your CC company and tell them that you are not going to authorise any further payments to them.
The funny thing is, I had the reverse problem when switching from BT to Talk talk. BT gladly gave me the MAC code but they are only valid for 30 days and the numpys at TalkTalk kept on letting it run out!