IMHO, you should have driven it right then and there and dropped it off at the dealership. Especially if the vehicle was exhibiting the pulling to the left issue as you described. That's a potentially dangerous situation and should be addressed without you having to wait four days.
As far as the loaner vehicle, even though yours is covered under warranty, the only way you'll get one is if you get the extended warranty through Chrysler. (chryslerwarrantys.com is a site with some great pricing, but don't buy right away, just register and they'll send you a discount the same day to your email address... and yes, that's the correct spelling) All Jeep dealers offer the extended warranty. (there's a lot of discussion here on the site)
Glad to hear it's been fixed. Seems with the computer system in this vehicle, most of the problems that have been posted are remedied by firmware updates.
Now get us some pics of your ride!