keeping it quick. BA messed up coding an upgrade on a critical flight avios-wise, so it looked like an pure award flight, so in order to get to lowly Silver on BA, I have needed to call BA several times. My BA account is now messed up, shows me as Bronze, with >600 tier points, but says that I have qualified as Silver (Sapphire).

Anticipating premium access problems, I got someone at BA to email me a letter confirming my status.

Here I am at SFO, in the airport, wondering whether the CX lounge is any good, as they won't let me in, and BA USA has closed for the night. Even better CX won't confirm in writing they won't let me in. It looks like until BA manages to sort it out, I am stuck in status limbo.

Main questions here are:
whether there is a better way to ensure access in these situations (e.g. ever any success getting BA to call another airline, in advance, to request exceptions)? and

roughly how long after tier points etc tick over to the next level should I expect it to take for the OneWorld system to update? It's almost enough to drive me back to *A (sigh).