This is the 2nd reply by support:
-snip-
When I check my app or when I recover my wallet to another phones blockchain app I can still see 9.7 SOL.
This seems like a MAJOR bug for blockchain.
Maybe not a major issue since it's quite common in other non-custodial wallets as well but usually can easily be fixed by a "
rescan".
Blockchain wallet however, may also be non-custodial as they claim but their whole system still relies on their server,
so if there's an issue with the wallet's state in their server due to syncing issue, only them can fix it.
The solution at the moment is to follow what their support is asking,
but make sure that you're talking to the correct customer support since there are a lot of fake supports out there.
I'd also recommend you to provide them the transaction id of the inbound transaction.