Hi all, need some help

I just bought an 2008 A4 Audi SE (new shape)last week, everything was going great until the weather started to get cold.

The car won't start, it cranks and take about 15 or more goes before it will eventually start once it has started it goes like a dream. I paid a lot of money for this car and just paid to have the glow plugs all replaced as when it does eventually start the wee glow plug light flashes for a while.

Anyway it's not the glow plugs so I had it hooked up to the computer it showed the crank shaft sensor so I have just got it replaced just be told nope it's not that.

I have it booked in with Audi now first week In February but I'm so worried it's going to be something major as I just used all my money to buy the car.

Oh and I bought it if a private dealer who won't answer the phone

Any ideas?

 

Just wee update never did get the problem sorted but the car was a total lie, the service book was fake, the tax book said one previous owner which was lies the car has been around the block. Oh and to top it off the miles where also lies, got our money back thank god . Be carful when buying car plz do full checks