Technicians visited me to fix the connection probl...

Technicians visited me to fix the connection problem and the main problem was the old phone socket at my house. So they replaced it to connect the nbn device. However, they took my new phone socket adopter which I bought at Bunnings without telling me. Is it common to take other's thing without telling? But they left the old phone socket after replacing though. That's why I only gave 3 stars even though they were OK.