Your record can never be expunged. Consequences for multiple offenders, refusals to take chemical tests or minors are even more severe. Don't let DMV or others confuse or stall you. You have many rights and defenses. Convictions, jail sentences, license revocations, interlock devices, and even probation, can be avoided.
Many cases result in acquittals or reduction.
It is critical that you speak to an attorney immediately. When you call DMV in Sacramento, you will encounter numerous tape recordings. You may encounter long delays and busy signals. Don't hang up. You must tell them that you want to have a DMV hearing called an APS hearing, and that you want an in-person, as opposed to a telephone hearing.