What happens to pending points when cancelling card?

[Rossy]

I have just reached the spend target on my BAPP and received my bonus avios points. I have no intention to put additional spend through the card and want to cancel it ASAP to maximise the pro-rata refund of the £250 fee. The issue is that my points won’t post for another 3.5 weeks. Has anyone got experience with cancelling a card that has an “avios to be transfered” balance? Do the points get posted straight away or are they lost?
Thanks

[VerdantBacon]

They’re lost, need to keep the card open until points have been transferred

[Rossy]

Thanks.
Sorry one other question, what happens to the pro rated refund? As the account is closed does it get sent back to the direct debit account?

[VerdantBacon]

You can ask for this to go to a bank account when you call to cancel