I think I got cheated at Motodepoo

[M.T.]

Also many mechanics involved in one oil change service session is quite bs story.

As I said, regular service is not just oil change, but includes some other services/jobs too. Is it possible that 2 mechanics can do different jobs with 1 bike or not, I don’t know. I’m not as specialist.
Second option is really as you said, some moves are undone and from there comes time saving. Hopefully authorized dealers don’t do this. But from cars side, I know the real cases where charged fully, but some parts are not changed.