Originally Posted by
jimmielin
There seems to be an issue with LATAM's IT then (what a surprise

) but try social media, they should be able to sort things rather quickly (or at least tell you the correct luggage allowance). Good luck!
That's what I ended up doing earlier today. They confirmed I should have one suitcase for free thanks to my BA status.
They also apologised for the IT issue and said I should be able to buy extra luggage over the phone. They actually offered to call me, but I'm no hurry.