Checkout what Pantene posted on their facebook page:

We’re so sorry for the glitches with our giveaway this week, and we want to make it up to you! If you weren’t able to claim a coupon due to technical issues, email us (Pantene.im@pg.com) with Your Name, Your Address, Your Email and we will send you a coupon for FREE Pantene. (US Only, until 07/05/11)
(Free shampoo or conditioner up to $4.99, excluding trial size. US only, 18 or older, 1 coupon per household.)

This offer ends today so hurry and email them if you didn’t get one last week!  These are mailed to your house,