Computor Software

I have a 520d M SPORT Auto (2012) (F10) have done 3300 miles and since new (June) the service indicator keeps dropping down BY 1000 MILES EVERY 400 hundred miles. When I got the car the Dealer had set the service indicator to 19,00 miles, for first service. Mainly the service indicator tells me I have to have the brake pads changed, when the indicator read 11.000 miles the Dealer agreed to check the car and told me it required a software upgrade, this was carried out but the problem is still present and the indicator is still dropping down, I feel the dealership is giving me a lot of bull****, I feel the problem is with the computer management system, and requires replacement but the dealer is avoiding the problem any help as to what I can do HELP