I always use the Bank's safeguard card system when purchasing anything online.
CW has not been on my list for a couple of years. It hasn't always been that way. Wasted potential and management issues. Not sure where their sense of urgency in fixing customer issues lie. It appears that they have been experiencing problems for quite awhile.
Safeguard allows me to produce a credit card number, to be used only for a specific company, and the amount I want that company to be able to charge on that specific number, which is associated to my main credit card.
So, if the item is $9.99, they can not process a charge for $10. The system generates a credit card number, security code, and date for a specific purchase.
You can contest the additional charge with the CC company.