I used the chat button to add names to my ressie and received a conformation email immediately
You can park 2 cars at the Disneyland Grand Villas for free.
They must be behind on the emails. On Sunday, I also sent an email to add a guest and haven't heard back yet. Usually hear back in a couple of days. Auto reply did say I'd hear back in 5 days, though.
You can have more than one car park at the resort without charge, with the exception that for the treehouses at SSR you can park only one car near your treehouse and must park any second car in SSR outside of the treehouse area.
Not always an option to use a phone. I would have called if it took too long. Not really in a hurry and would rather not sit on hold when I have things to get done.