No notification email when paid by pay as you go credit?

So I just install pay as you go credit. Go to admin cp > account and add 999 credit to a test account then use it to change Plan. Normally if I change from one plan to another that are free, I got notification email saying that my plan has been change to XYZ. But when I change to a paid plan and use pay as you go credit. I didn't get any notification email for plan change, only notification email that transaction went through.

Also how do I edit the pdf file generated sent in the email. Transaction ID is 0 and seller info is Blank on that pdf, only buyer info show.

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