Possible ***** and ******* debit system

This is very serious, they have used a credit card I paid with in February and which details I removed from the client zone system 2 months ago to deduct a not-properly announced and not timeously warned amount. They think they have the right to just have a self appointed debit authority to use the last card you used if you didn't give a new card detail when the system is supposed to allow for client on invoice payments. This is after having had more than 5 complaints regarding their billing which the accounts department themselves have been in error every time over the last 12 month period so why would I trust them with an automated payment authority on one of my credit cards. I gave it initially and when they kept getting it wrong I removed it, now they just used it. If there is no forthcoming apology and rectification this will be reported as ********** transaction and ******* accounting practice. This is how they treat a client that has been with them since 2008 at least. I am not saying I do not owe correctly some of what is billed, I am saying they had no authority to automatically take that amount from that credit card.