You can reset it yourself. But depending on what ever the car service plan it was on before "ie life long service" is what it will adapt to again after the reset.
It tells you in your hand boot how to do it. Otherwise if you lazy here it is.
On the dash of your Audi there are 3 buttons under the fuel gauge,from left to right the 1st one just forget about & the other 2 we will call 'A' & 'B' (B =closest to fuel gauge).
1.press & hold button 'A'
2.switch ignition 'ON'
3.release button 'A'
4,the words 'SERVICE' or 'Service in xxxx MI' will appear in the trip recorder display.
5,now press button 'B' until the display clears & is replaced with the new service interval or 'SERVICE'
6.switch ignition 'OFF'