I sent an email to support last night. I had 3 accounts active in July, all 3 were billed normally, but then one of them was cancelled in error. I reactivated after reentering my payment information, and that account was now double billed. We did not get a refund for the July billing. First time I've ever been double billed by SE, and apparently the last because I have no way to pay for my accounts anymore using the new system >.>.