You can reach them through the official portal for Mexican embassies to the USA. Or you could write to them at the following address, Mexican embassies however serve you on a walk in basis. It may not be possible for you to get an appointment over the phone even if you could call them up. Their address is 100 W. Washington St., Orlando, FL 32801.
Do you know what is required to obtain a new passport for a female Mexican citizen with resident status in the US