Alleged opportunity to work for the Ministry of Health

Today, I received a call supposedly from human resources offering a position as an administrative assistant and telling me I had to register as a small taxpayer with the SAT and pay 600 for this procedure. At the last moment, I said I would do the procedure elsewhere, and they told me they would deposit an amount because I needed to undergo some medical exams and that they would deposit 1100. However, that supposed bank transfer never arrived.