In the case of missing a letter from the IRS, I could call a friend who is a lawyer or ask, say, a professor of law what they would recommend, who I should talk to, how had people handled this in the past.
U slučaju propuštanja pisma od Porezne, mogao bih nazvati prijatelja odvjetnika ili pitati profesora koji predaje pravo što bi oni preporučili, kome se obratiti, kako su drugi rješavali slične probleme.