Buying Aerolineas ticket without DNI

[tkm]

I'm planning to buy ticket to El Calafate from Aerolineas website but stuck at the payment step. My company HR has not confirmed with me the progress of my application for DNI so I don't have it for now.

Any advice on how I should proceed with it? Do I have other options?
Can I use the CUIL/CUIT number to pay online instead? Or go down to the Aerolineas office?

Thanks!