The archpriest of the Sagrada Família has a social worker dedicated to attending to all the people who may need guidance or advice.
It works by appointment, which you can request on 933 441 650. Its service office is located on the premises of the Immaculat Cor de Maria parish (C/ Sant Antoni Maria Claret, 45).
For urgent situations, you may go in person to the office of Càritas Diocesana de Barcelona (Plaça Nova 1, next to the Cathedral).