The Deposit Confirmation states final payment of 9 July (done on 27 June). We received a Booking Confirmation on 6 July. Looks like they have deducted the balance of the 3 Sept fare from the amount paid for the 22 August cancelled sailing. There is a "net due", which is the credit OWED TO US so I will be chasing that up on Monday.
We are using a Princess PVP (based in Sydney) and she has been excellent, knows what she is doing, and amazing communication. (We initially booked over the phone and struck a grossly inexperienced person who barely spoke English had to get advice every time I had a query - really hopeless, I guess it must be an awful struggle for them and the other cruise companies at the moment so I try to be patient)
Best of luck, I am sure it will all work out just fine, it's hard "waiting", I know.