Then I don't know how the seller computed the taxes that are owed. One possibility is that they are adding sales tax for the state in which the shipping center for the phone was located (if different...

I'd not be surprised that what the customer service rep has access to doesn't provide a breakdown of the taxes that are included. They likely just see the same sales receipt you have. Was this the...

Just to be clear, what exactly does the line item say that has the sales tax on it?