A server upgrade nightmare - DO NOT UPGRADE

It is now heading for the 3rd day, where what was to be a simple server upgrade, has caused a client to have no company mail and no clear resolution in sight.<br> <br> I have had to continually call the call centre, I have spoken to tons of customer support people. I have spoken with most of their Supervisors. I have been told that I could not speak with any technical person, then been put through to speak to a technical person. And still no one is assisting. Each person performs their assigned task and then passes the issue on to another person to start the resolution from the beginning. They wait for the end of the shift or the end of the day so that they can 'fob' me off, instead of following up and ensuring the job is done.