Nathan, that's exactly my situation. I travel for work 5+ days per week and this is the first time in 2 years that this has happened. Between fuel stations, breakfast/lunch/dinner, accommodation & work consumables I can gather 50+ receipts per week.
A credit card customer receipt is not the same as a tax invoice. Not being given a tax invoice means I lose out on $300.
Does anybody know if there is any authority that I can go to to take this further?