I agree it is a complete shambles and I'm not sure if it's manufactured or utter incompetence at this time but they have issued an apology. Whichever it is somebody is in completely the wrong line of work.
“We are aware of the problems on the MCFC ticket website and working hard to resolve the issue. This is also preventing us from selling tickets at the Etihad Stadium ticket office. We apologise for the inconvenience caused & we will let you know once the issue had been resolved. Thank you for your patience.”