The English-only answering service is where Spanish inquiries die
Overflow and after-hours cover is the least examined part of most intake systems and the place a bilingual market loses the most matters.
Call your own firm at six in the evening and ask for help in Spanish. Then call at lunchtime, when the front desk is at lunch and calls roll to the service. Record what happens. Most partners have never heard the experience they are paying to send people into.
A caller who reaches someone who cannot understand them does not leave a message and try again. They hang up and call the next firm on the results page, and in this market there is always a next firm.
The fix is rarely a new phone system. It is briefing the service properly, giving them a short Spanish script for the three things they must capture, and setting a callback promise that someone in the office can keep.
Where the volume justifies it, a dedicated line or routing option for Spanish is worth more than most website changes, because it removes the moment of hesitation at the start of the call rather than later.