Only half of my accounts emailed

Last month I called the call centre and asked that my invoice for account ***) to be emailed to me as opposed to post. On Saturday I received the invoice for account *** only. Linked to this account is number ***, which when I get a posted invoice is contained on the same invoice as ***. The email invoice contains no information for number ***. How if 2 accounts are linked and 1 invoice is generated when the option is to post my invoice that the same does not apply to email? Does this mean that you are going to still post the invoice for ***? Doing this twice is a waste of my time!!!