Additional Charge

I am not surprised. I had a similar issue and it turned out to be
Amazon.com failed to provide information regarding fees from the
actual seller of the items I purchased.

They should do better than telling you that are adding wrong. Perhaps
you are, but they should be able to tell you how the math is being
performed.

Unfortunately, too few customer service people will do this. They are
not trained to figure out where the problem lies, and most likely
aren't given the time to sit and stare at numbers to figure out if
there was an error (on whoever's part) or not.

Without seeing the details of your order, I surely can't say what they
problem is. I can make some guesses, from past experience. It's
quite likely that none of these apply to your case, but here goes:

* If an item from your order was from a third party, you need to pay
shipping on that item, even if Amazon is offering free shipping. I've
had several cases where I've been puzzled by shipping costs, only to
find that one item in my shipment was actually being sold by a third
party.

* Amazon sometimes changes prices, even after you've completed an
order. Usually, they cancel your order in these cases. However, it's
possible that due to a timing glitch, you're being charged a revised
price. This can happen, for example, where the original price was in
error. However, given that this appeared as separate charge, I doubt
this is what happened here.

* You thought you were getting the free shipping, but for some reason,
you can't get it. So, they are taking on shipping charges.
Obviously, they shouldn't do this without asking you first if you want
to cancel your order or pay the shipping.

* The price you see on the screen is not what's in their system. This
seems odd, but sometimes there are two separate systems which could
have different numbers. In fact, just last week, I was talking to one
of my customers about his inventory and ordering system. Apparently,
he loads the inventory from one system to another through an automated
process. However, if something is amiss, he goes into the second
system and manually overrides. He's supposed to go into BOTH systems
and manually change (since changes in system 2 don't flow back to
system 1), but sometimes he (or one of his staff) forgets. Or, more
likely, the first system is unavailable and so the change only gets
made in the second one. In any case, I don't know if Amazon has this
situation or not, but it could happen.

No matter what, they need to provide you with an accounting at how
they arrived at the total. Blaming you without explanation is not
useful and no nice.

What did you order, how much was each item, and how much was the
shipping? Clearly you disagree with Amazon, but without the details
there is no way to know what the discrepancy is.

All the facts will show where the difference lies. You have only
provided the totals.