While different, Miles and/or CoPay not deducted on award booking/ upgrade is about a similar case where the "supporting payment" had not been withdrawn.

With you having called, it should get resolved. I'm not sure I would have bothered to call since if the miles did get withdrawn (very unlikely IMO) then a call at that time could have gotten it fixed.

With the change that PlusPoints are not withdrawn at the time of application, UA has created the potential of this problem. Even in the prior system, there were times where GPUs were not withdrawn and sometimes the upgrades still occurred. The antiquated nature of the IT systems are fraught with these occasional issues.