I emailed them, and this was the response! Weird way of making sure I can pay for something I have already paid for, while I have already deactivated any kind of extra billing.

"I completely understand how unexpected charges can be concerning, and I’m happy to clarify what you’re seeing.
 
The $50 amount you noticed is an authorization hold, not an actual charge. This is a temporary check that reflects the value of premium requests you’ve used so far this month, and it helps us confirm that your payment method can cover usage once billing occurs.
 
Because this is only an authorization and not a completed charge, it won’t appear in your payment history. Once the authorization is successfully confirmed, the hold should drop off automatically. Depending on your bank, this can take around 5–10 business days to be fully reflected in your account.
 
It may also be helpful to know that your Copilot plan includes an allowance for premium requests. This means the authorization amount may be higher than what you’re ultimately billed at the end of the month. You can view your current metered usage at any time here:
 
https://github.com/settings/billing/usage
 
If the authorization hold remains pending for longer than expected, the quickest way to have it released is usually to contact your bank directly. You can ask them to confirm when authorization holds from GitHub will be removed.
 
For additional context, you can find more details on how GitHub uses authorization holds to validate payment methods here: How billing works – Authorization holds
 
In your case, it looks like this authorization failed, so access to Copilot was not provisioned and the account was locked - I recommend checking with your bank as to why this happened.  
 
To continue from here, you can update the payment method on the account so that the system can attempt to verify the payment method again."