So today I attempted to purchase the Episode 6 pack again using a different payment source but still on the xbox store, and this time it went through. When I switched back to game, I had received the 2000 AC that I had previously bought and I also received the episode 6 pack that I just purchased. So that means that I have received everything that I have actually been charged for. However, I am still getting the same error code (953) every 30 seconds.
Converse with fellow players