Log the minutes between the form hitting your inbox and a human calling back
Response time is the single number most immigration firms have never measured and most could halve this week.
Someone submitting a form at nine at night has usually contacted more than one firm. The order in which those firms call back matters more than any argument about who is better.
Start by measuring. For thirty days, record the timestamp of every inquiry and the timestamp of the first human contact. The gaps that turn up are usually worse than anyone in the office believed.
Then set a standard and staff to it. During business hours, minutes. Outside them, a short acknowledgment that names a person and says when the call comes. An automated receipt that says thank you for your inquiry does not hold anybody.
Route by urgency. Anything mentioning a hearing date or a detained relative should reach a phone, not a shared inbox that gets checked at ten the next morning.