Anyone else got charged? Payment Started?

[Catapult]

The only possibility that comes to mind is that you have an XI account that has moved over to your SE account. If this is the case, the charges may be legit - compare them to your XI costs.

If you don't have an XI account, what you are best-off doing depends on what country you live in but in general the following procedure would apply for best outcomes.

- Check your bank balance and recent transactions. You want to ascertain if the charge actually happened or if this was just a glitch email.
- Contact Click&Buy. I know this sounds futile, but you need to at least make a reasonable attempt at resolving the matter personally or it will make things harder down the line. If my memory is correct (and my memory is hazy on this), then their customer service hours may be limited to morning business hours, German time. I'd try then.
- Contact SE through their portal. Same reasons for doing this applies. Use phone if there is an SE office in your country or you have a VOIP phone. If not, use email, although a response will take longer to get.
- If you get an unsatisfactory or no response, contact the UK financial ombudsman. Do NOT sue either company directly. Do NOT make any threats of action yourself other than to say you'll be going to the ombudsman. The ombudsman exists for the purpose of resolving these cases.

Cancelling your credit card may be a wise move, but is ultimately done at your own discretion. If you want to take the risk that they may charge you again, that is of course up to you.

Do your best to remain calm and collected at all times. Having worked in a call centre, I know that the customer who does so is taken much more seriously and people will more likely go out of their way to help you.
The customer who flies of the handle gets treated as a simple whinger and has their calls terminated.
You are looking to dispute an inconsistency in billing, not complain about theft.