Itny tension hai to you should visit the workshop daily to keep a follow up on the work being done.
This way you can keep a check if they working on the rear fender, why is the bonnet open.
Yes change of parts is very common. I gave my Cultus to Suzuki in 2022 for bonnet repair job, later I came to know rear bumper lights were not working on close inspection the wires were disconnected. They probably replaced the rear bumper with another car in haste.