First they do not have an office in Salta airport. Someguy delivers the car in the airport and takes an imprint of your credit card in his private vehicle.
Second, we were charged 930 Argentinian Peso 11 days after car return safely and satisfactorily to sixt agent at Buenos Aires without anybody letting us know why... They do not answer e-mails as well as their international company Sixt customer service. They do not send any bill/relevant document to this regard.
The ignorance of customer service is outstanding.
Choose another alternative.