Yes they blew that advantage they were supposed to have for sure. Hope you are able to get one soon, though with Amazon saying 1 to 3 months and Scan saying pre order, overdue since 31st July, it doesn't sound promising. Will keep an eye out for availability anywhere or rumours of.
ll you got it all from Amazon you would probably have a right to do that as by the time they get you a CPU you might have run as much as 3 months of the warranty out on the MB etc. Right now you would have goods not fit for purpose as you cannot use anything if it's down to them. Maybe time to put some pressure on them if so and if they weren't truthful about the situation then you have them where you need them.