When I got the car in May there was a free service offer on used cars when purchased in conjunction with Audi finance.
I asked several times after pickup if I should have recieved any written confirmation of this and was told that its on the system and it will be picked up when booking in at service time. It was the 2 free services within 24000 miles offer.
Just tried to book in for a service 7 months later and its not on the system!
I recall A8s, R8s and S8s where not included but waiting to hear that S4s are not included too. Its currenty being looked into.