After adding another bag to a Virgin Australia booking, should you get some sort of e-receipt?

Following on from my question last month - When booking elsewhere, how do you know what Virgin Australia ticket type you will get?, I decided to book my Virgin Australia fare elsewhere knowing what it was, thanks everyone!, then add an extra bag on later.

Annoyingly, the Virgin Australia website didn't let me add one more piece of checked luggage online, so I had to ring them up to do it - something about it being a travel agent booking apparently? Anyway, I eventually spoke to someone helpful in their customer services team, paid the fee on my card, and added the bag.

That was all about a week ago, and I took the flight in question, with my extra bag. That all went well. The charge for the extra bag has arrived on my card too, so I did pay... But no receipt was emailed to me, neither after my phone call to add the bag, nor after the flight!

After paying to add a bag with Virgin Australia, is it normal to get some sort of receipt from them by email? Or if not, is it possible to get one from them some other way, perhaps by emailing?

(Work might cover my extra bag, but only if I give them a proper receipt for it - one line highlighted off my bank statement labelled "Virgin Australia" is unlikely to convince the accounts team to pay me back...)