Complex excuses from Amazon

After changing my royalties payment procedure with Amazon I received a massive payment from Amazon UK (I wish), about four days later. I then wrote a polite letter to Amazon US enquiring when I might be paid by them. The next day I received this:

Hello, 

I see that you have changed your payment method and currency from Check in USD 
to EFT in GBP in Amazon.com.

When updates are made to your payment details, they will only apply to royalties 
collected after the change has been made. 

As you currently have royalty earnings that are under the payment threshold, we 
have requested a one-time exception to pay these royalties according to the 
current currency and payment method selected i.e. EFT in GBP. This process may 
take up to 15 business days as it involves complex process and approvals 
(currency conversion). 

You can expect this payment to be paid out to your bank account in the last week 
of January, 2014.

I hope this helps. Thanks for using Amazon KDP.

    What kind of financial genius does it require to check the computer for my total sales, deduct their cut and that of the IRS then send me a transfer minus their banker's fee?

    It wouldn't be because they're all partying on the fat profit they're making from us and don't have anybody sober enough at this time of year to devote the almost five minutes required to calculate the pitiful amount they owe me. For everybody else owed money by Amazon, I wish you luck.

    Next year I'm actually going to begin the process of telling the world that I exist and perhaps selling some of the books I've spent so long writing.

    And to everybody, have a happy and prosperous new year.