This post should be in the blindingly obvious category. But if it's so obvious, why did this happen...?
I call a cable company to consider switching my telephone to them (it's so competitive, each provider continually sends through new offers).
But the person on the phone hadn't been told of the offer and tried to give me one that wasn't as good.
Eventually it was ironed out...but shouldn't that person have been informed about what offers were being made? Seems a waste of money to me if the person charged with doing the selling doesn't have all the firepower available.
So if you make an offer in your newsletter, make sure you tell your staff about it. And teach them how to present the offer when the customer calls.