Originally Posted by Hyacinthe

Let me put it that way
-Statement 1:

• 1 flight, $5000

Puchases-returns on statement, $5000 -> 5000 points earned.
-Statement 2:

• 1 flight, $5000
• 1 flight refund, -$5000

Purchases-returns on statement, $0 -> 0 points earned.

No matter how you do it. If you return a purchase of X dollars, you will get X points deducted from your new purchases.
It can help fast track to make a refundable large purchase but you won't get free points for an item later returned/refunded.