Maybe need to improve training.
I bought a book that left a balance due because my credit card on file expired.  I loaded in a gift card to try to correct the situation...it did not.  I did not think the gift card worked so I clicked reload.  Surprise, it charged my credit card and added an additional balance to my credit.  It took over an hour and three different chat sessions to pay of my $5.00+change debt.  The last chat person I talked to fixed it within five minutes.  The middle chat told me with authority that kindle purchases cannot be made using a credit balance...only merchandise.  I found that not to be true.
Rating: 2 stars