A Spanish-speaking caller who reaches an English-only phone is a lost job, not a bad lead
In a county where Spanish is the dominant home language across large areas, the language capability of your intake is a conversion setting, not a cultural nicety.
Audit the whole path in both languages. The number that rings, who picks up outside business hours, the voicemail greeting, the automated text reply, the quote document and the follow up emails. Most dealers who translate their advertising stop somewhere in the middle of that list and never notice where.
Listen to a sample of calls in each language and mark the point where they end. Language mismatch produces a very specific pattern: short calls, no name captured, no callback booked. It is easy to see once you look and invisible in a lead count.
If you cannot staff a Spanish line in house yet, a bilingual answering service that books measures directly into your calendar is a reasonable interim. What does not work is taking a message in English and hoping the callback lands.
Check state rules before you switch on call recording, and confirm with your own counsel. Recording is useful for this kind of audit, and it is not something to enable casually.