Dark patterns in action

I sadly got bit today. I bought a Freedompop hotspot. After entering my billing information, and after the processing screen, a screen showed an offer for a $30 phone.

I intended to click Skip, but my mind clicked Accept this offer, because it was the primary button. Its a $30 loss, but inevitably, I will save hundreds with the hotspot.

After the accept this offer, there was no confirmation, just finished the processing screen with no way to cancel the order.