What is the ruling on the office owner taking money from the Umrah pilgrim, and what is the ruling on embassy employees who are suspected of taking a portion of the amount paid to the offices, given that the visa is free and the ambassador has declared this?

Visa office proprietors deserve a fee for their efforts in obtaining visas, even if the visa itself is free. Suspicions that embassy employees receive bribes do not preclude dealing with these offices. The sin, in this case, falls upon whoever pays the bribe without the visa applicant's knowledge.