what happens if I end up filing a complaint and they are responsible?
DMV will take action against the shop. This may include suspending or revoking the shop's registration and/or imposing fines. If you suffer a financial loss due to overcharging or unnecessary or poor quality repairs, the administrative law judge presiding at the hearing may offer the shop the option of paying restitution.
I'd like to know on what are the things I need to do if I want to complain the shop?
*makes no sense*