You need to respont to the notice at least 20 days  before the effective date of the downgrade
what if the downgrade has already occured?
You must complete and presend an application to reinstate your commercial priveleges
I do not understand why my commercial privileges were revoked for me it is unfair please return them
You can find rejection's cause by reading the letter throughly.
Have you checked the certificate in case any information was incorrect, missing or illegible?
No, i haven't.
Unfortunately, no relevant information is found.
Can you tell me what advantage i get sign in up for MyDMV?
Sure. It can give you more control about your doings for check your certificate status, just checking under License Status.
Umm, is there any way to receive reminders for this type of procedures?