it's a little hit or miss. i had to email support about a Madden/400 point offer I received. i suspect with Summer of Arcade and this offer they are getting better at it.
email support if you don't get your points. you will get them. you shouldn't HAVE to email them...but what are you gonna do? free is still free.
What email address did you use to get your points? I was expecting the 1200msp from the Summer of Arcade promo by today, but I have not received them yet, so I guess I will email them tomorrow... good job M$!