eBay Invoice dates

[Killed by Ebay]

the majority of my accounts have the invoice period from the 15th of the month to the 15th of the next month,

I have some other accounts in which its from the 1st of the month to the end of the month.

Is it possible to change all my invoice dates to 1-30 instead of 15-15? I havent been able to find an answer to this and trying to avoid calling

[MM78]

Straight from the Mules mouth....

*WARNING, EBAY LINK*
http://pages.ebay.com/help/sell/payment-due-date.html

The date we create your invoice depends on when you created your account, and can't be changed. We also can't change your payment due date.