Originally Posted by
crimsona
Tried to buy United Travelbank, had error saying credit card you've entered couldn't be processed, but Amex sent a notification stating that there was an online charge for the amount.
Did it simultaneously go through and not go through?
Check if your UA TB balance increased. If it did then you know it went through anyway. If it didn't and the charge posts then you have to fight it out with UA to get the funds.