Sorry Den, I meant to say welcome to the forum!!!
I think there are 2 types of service programmes - one that is fixed (ie every 10,000 miles) and one that's variable (when the car t like you it's ready) chances are that yours could be the variable type and they have just ran out of sync and the next major service could bring it all together.
Suppose the dealer will say the car wasn't due a service for another 1000 miles it so, and they sold it with a full and completely up to date schedule.
But id give them a call and ask them to explain it in detail, as I'm not an expert by any stretch of the imagination! But you could ask them about arrive plans, as there are a few deals to be had if the car if over 3 years old.
For me, whenever I buy a car I've learnt to ask them for a major service as a condition of buying it - worst they tend to do is an oil change, but I see that as another couple of hundred quid in my pocket.
What engine / spec / age did you go for? Loads of good advice on here from this lot, oh, and a bit of banter. Hope you enjoy the Audi experience.
Gordie