Honda 2 Wheelers India — Honda activa service

Address:

Hyderabad, Andhra Pradesh, 500018

Hi, i recently gave my honda activa for servicing at honda service center, erragadda, hyderabad-500018.
But i found that they haven't done any service to my vehicle and claiming as they have done the servicing. I gave few complaints about the following
1. Tightening of brakes
2. Setting mirrors in position
3. Exhaust (Silencer cover) rear
4. Front cover
5. Fixing of buzzer for indicators
They said that once the servicing is finished they will call me. After 5:30 they called me suddenly and told to pick up my vehicle as the service is done.
Then i reached the service center in about an half an hour. When i reached there, my vehicle is as it was before when i gave it for service except cleaning. No work is done. When i asked them about it they are saying exhaust cover is out of stock, brakes can't be tightened anymore, mirrors can be fixed in front of you, and they bought the buzzer and forgot to fix it.
Also they are saying they have done the service.
My question is you haven't done any work ive given then how should i believe that my bike got serviced.