Booking a private bus (Santiago de Chile)

Hello All, we are a group of students visiting Santiago in the 2nd week of March as part of our study trip.

We are currently in a situation where we have to visit one industry one of these days early in the morning and we are in need of a bus that can pick 32 of us from Santiago and drop us at San Antonio.

In this regard, we are in need of your help in terms of options and advice. Every single bit of information will help us a lot. :-)

Thanks in advance

Sudarshan