"We regret that you didn't get the seat you expected on your recent flight, and sincerely apologize for any inconvenience this may have caused you. You are correct Economy Plus is complimentary for Premier Gold; unfortunately, there was no way for the Flight Attendant or Gate Agent to verify this on the new computer system. At this time, we cannot offer anything except an apology. The computers are being synchronized and senior management is aware of the problem."
Translation: Due to poor implementation of our change of reservation systems, our gate agent was not able to verify your status online. Due to incompetence of our gate agent, she did not understand our actual policies. Due to your incompetence by choosing a carrier that has demonstrated it does not intend to keep its commitments to its frequent flyers, it is your own fault and you are not due anything more than an apology. Yes, pretty disgusting.