I also need more info about Complaint process. And does the same thing happen when there is an unresolved complaint?
Not quite. In that scenario, your case would be sent to an Automotive Facilities Inspector for a formal investigation. When that happens, is advisable to cooperate fully with DMV's inquiries.
I guess there could be a chance to just pay up and be free of furhter process, isn't?
Well, yes. You can get the chance to admit your charges and then pay a specified monetary amount. If the waiver is accepted, then no hearing is required.