So I figured I'd open a refund request and maybe in a few weeks I'd get a few bucks back.
-Less than 24 hours later-
I get a friendly email from a customer service rep who was apologizing for the delay in responding, and enough sim points to turn being overcharged 20% into a 25% discount. :)
Woot! A good customer service expirence. :)
P.S. I know I technically didn't get a refund and that these sim points are just some ones and zeros in a database that they have an infinite supply of. Software and Content distribution costs pennies, but creating it takes a lot of time and talent. If some in game object has value to me, then I'm ok with spending actual money to acquire it. As a paid software developer myself I'd be a hypocrite if I didn't.