Points related

I bought a 30,000 won coupon and some rice, leaving me with 1,500 points. I deposited 10,000 won into Kakao Bank and ordered a 6-pack of unlabeled bottled water. However, 2,355 won was deducted from my points, and the remaining 1,235 won should have been deducted as well. Shouldn't there still be a balance in my Kakao Bank? They withdrew 10,000 won; how much did I actually pay for the water?

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