Absolutely incapable to handle customers queries

Book a flight 4 months in advance. 10 days before departure, get notified flight has been cancelled and an alternative flight for the day after originally scheduled was proposed. . Make contact via email to say new proposed date wont suit and am happy to pay to fly earlier than originally booked if this can be arranged. Consultants (Sheldon) commits to the change. 1 week later, 3 phone calls to the call center all over 40min long & not able to get through to anyone in the schedule change department. Numerous emails unanswered & contact via twitter, social media team promised on 2 different occasions someone would call. Still waiting. Supposed flight is now in 2 days time. Inefficient, incapable and never ever to be used again.