Buying a new car deal issues

[castellan]

What is the go with all the stuff that can go on.

I signed up for a new car on 7/10/15, it's a demo that's been rego on the 31/8/15
I put the deposit down on it and thought I would get the car that day or the next but after I put down the deposit and all they say I can't get the car until 13/10/15.
I test drove a black one a week before (I don't want a black) and then found out they had a red one on gumtree with 10KM on the clock, so I rang the dealer up and said what's the go, it was a deal that did not go through because the other party could not get finance.

Now that's the spile, but maybe it's a lemon, something is wrong with it, damaged or something, I am thinking.
I have not seen the car yet.

They say they have sold that many cars that it will take 7 days to process the bloody thing.
I think that's B/S the bloody thing is rego and all, I can't believe that, as I think they are trying to hide something now

I am getting cold feet and will walk away from the deal is what I am thinking to do. it's a bad felling I am getting.

I have bought many a new car and never had to wait more than a day for the car to be rego and handed over

Am I right or just freaking out.