We only send confirmation transactions on original registration. When you get additional shares, they add to your count but you do not receive a followup confirmation.
If you were already getting your upvotes from @sbi5, you would need to check our tracking sheet to confirm whether your new enrollment was completed. Similarly, the person you sponsored would only receive a confirmation transaction if it was their initial enrollment.
It happens that the account you enrolled eight days ago received their transaction confirmation 3 days ago, which would have been at 5 days from when the transaction was received:
(source: https://steemit.com/@unlisteem/transfers)
I will ask @unlisteem if he already got the congratulatory message. If he already have it... thank you very much and more power.
It's a public blockchain, you can check his wallet yourself. As it happens, that image was a screenshot from his wallet (as shown in the source).