When you have more than one advertising method, it’s always a good idea to check on their billing. These networks do make mistakes, here is one example.
Hi,
We experienced an issue this week where we may have charged your credit card for Facebook Ads although you had an active advertising credit on your account. We sincerely apologize for this error and any confusion it may have caused. We’ve now refunded these charges to your credit card. There may be a delay before this refund is processed by your credit card issuer. If we tried to charge your card and the payment failed, this charge has been cancelled. You will not be charged again for these ads.
Thanks again for advertising with Facebook Ads.
Sincerely,
The Facebook Ads Team
I know that Facebook put some charges on my credit card, that weren’t warranted.