brake fluid replacement.

as per 45 000 km service schedule .... brake fluid to be replaced. when i received a call to pick my vehicle up as the service was completed, i immediately asked to speak to the technician who worked on my car and asked him if he had replaced the brake fluid, which he rep**** that he did so. Why i asked this is because that replacing brake fluid takes a bit of time and most of the time technicians just top it up.I revealed to him that i put prestik on all the brake fluid nipple nuts and rubber dust caps, so that if he had to open it ,there was no way the prestik would be on there and i checked it immediately when i got there and found that not one of the bleed nipples were opened (i have photos of the bleed nipples with prestik on them ) .they were exactly how it was when i gave it in for service. The technician had no words and walked away , he could not argue with me because he knew what he never do, which is replace the brake fluid... he had been caught out.I left the car there and told the service adviser to sort it out, and later when i went to pick up my car , i discovered that my flash drive was taken from the glove compartment which i had hidden earlier that morning.