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Hi CN4BMH and welcome.
We are always happy to have new members.
From reading your post it sounds to me like your buyer may have had a negative balance when they initiated the transaction. This would have taken the amount you charged which you say was $9.99 after the discount and any negative balance. If you have checked from your side and everything is showing as correct then this is the only explanation I can think of. If you are still in contact with your buyer I would recommend that you ask them to check this.
I hope this helps,