Cambelt change advice on A4 TDi

[Mattlan]

Recently taken over a company A4 Avant 1.9tdi Quattro sport (04 plate) and noticed from my previous colleague's servicing paperwork / invoice (at 56,000 miles) that they were requiring the car to for a Cambelt change in 4,000 miles. Thought nothing of it until I had ten minutes spare waiting in the car recently and decided to actually read the service handbook, in which it stated that the cambelt change was required at 80,000 miles. Suspicious as ever, I phoned the dealership and queried this issue, was told that Audi also advised direct to dealership of various changes to servicing requirements as and when necessary, but he went away and checked and sure enough my car was not requiring a change until 80k...
My question is this....was this a genuine error, or a way of inproving cash flow ( I understand this is a major £500+ job)by bringing the job in earlier than actually required and relying on the fact that the car is company owned and therefore no one is too bothered to check the timing of these matters? Any views?

[Mattlan]

Thanks for the advice guys