Clear 'Inspection due in ___ days' alert!!!!!

Hi so I recently bought an Audi from a garage 2 hours away from my home. The car has been thru its MOT and service in July but has came up with the 'Inspection Due' notification on the dash. I called the garage and they have assured me all services have been done and I have proof of this also. I purchased an OBD2 meter off amazon and had no luck with it to clear this fault! I have seen you can do it with one of the SNAP-ON diagnostic tools but they seem quite expensive and I don't really want to fork out to buy this JUST to clear a fault!! Has anyone done this themselves or know a tool fairly cheap to do so.... also do I have any other options would a local dealer do this? If anyone has advice this would be very helpful. Cheers.